Iron Twins Fortress Dungeon Guide | Raid Shadow Legends

Iron Twins Fortress Dungeon Guide | Raid Shadow Legends Dungeon Bosses
The Iron Twins is a Raid Shadow Legends boss that can be found in the Iron Twins Fortress, a dungeon that resets every day and changes its affinity daily. This challenging encounter requires players to be swift in defeating the metal monstrosity, as the difficulty increases over time. To achieve success, players must have a well-planned strategy that accounts for the boss’s mechanics, which we will now explore in detail.

Dungeons Index

Iron Twins Content

Iron Twins Farmable Resources
Iron Twins Strategies
Iron Twins Champion Tier List
Iron Twins Fortress Video Guides

Iron Twins Fortress Content

Iron Twins Skills
Iron Twins Guide
Iron Twins Stats

Iron Twins Guides

Dragon
Fire Knight
Ice Golem
Spider
Minotaur
Iron Twins
Sand Devil
Phantom Shogun

Iron Twins Farmable Resources

Mortal Soul Coin, Immortal Soul Essence, Eternal Soul Essence

Iron Twins Fortress Skills

  • Voltaic Pendulums Attacks 1 enemy. Places a 30% [Decrease C. RATE] debuff for 4 turns. Also places a 25% [Weaken] debuff for 4 turns if the target is already under a [Decrease C.RATE] debuff. Will ignore [Unkillable] buffs whenever the Iron Twins’ HP is equal to or less than 40%. After attacking the initial target, attacks all other enemies. Places a 50% [Decrease ATK] debuff for 4 turns. Also places a 60% [Decrease DEE] debuff for 4 turns on enemies under [Decrease ATK] debuffs.
  • Fires of Insanity (Cooldown: 3 turns) Attacks all enemies. Places or extends [Ironbrand] debuffs on all enemies. The duration of each [Ironbrand] debuff given depends on each enemy’s DEF. The enemy with the highest DEF will receive 7 turns of [Ironbrand]. The enemy with the next highest DEF will receive 8 turns of [Ironbrand], while the enemy with the next highest DEF will receive 5 turns of [Ironbrand], and so on. If an enemy already has a [Ironbrand] debuff, the duration of their current [Ironbrand] debuff will be extended by this number of turns.
  • Ruinous Swath Attacks all enemies. Places or extends [Ironbrand] debuffs on all enemies. The duration of each [Ironbrand] debuff given depends on each enemy’s ATK. The enemy with the highest ATK will receive 7 turns of [Ironbrand]. The enemy with the next highest ATK will receive 6 turns of [Ironbrand], while the enemy with the next highest ATK will receive 5 turns of [Ironbrand], and so on. If an enemy already has a [Ironbrand] debuff, the duration of their current [Ironbrand] debuff will be extended by this number of turns.
  • Doomsday Machine [Passive] Attacks all enemies 2 times. Each hit places or extends a [Ironbrand] debuff. The first hit places a [Ironbrand] debuff whose duration depends on each enemy’s DEF. The enemy with the highest DEF will receive 5 turns of [Ironbrand]. The enemy with the next highest DEF will receive 4 turns of [Ironbrand], while the enemy with the next highest DEF will receive 3 turns of [Ironbrand], and so on. If an enemy already has a [Ironbrand] debuff, the duration of their current [Ironbrand] debuff will be extended by this number of turns.
    The second hit does the same, but the duration of the [Ironbrand] debuffs placed depends on each enemy’s ATK instead. After the first two hits, attacks all enemies again. The damage inflicted to each enemy increases according to the number of turns remaining on each enemy’s [Ironbrand] debuffs. This hit will ignore 30% of each target’s DEF.
  • Retaliatory Launch [Passive]: Whenever the Iron Twins’ HP drops below 80%, 60%, and 40%, instantly attacks all enemies, then removes all debuffs from the Iron Twins. Fills the Iron Twins’ Turn Meter by 10% whenever an enemy receives a buff. Will not fill their Turn Meter if the Iron Twins are under [Decrease SPD] debuffs. The Iron Twins receive 50% less damage from each subsequent hit from multi-hit skills. The damage reduction increases with every additional hit. The Iron Twins are immune to Turn Meter reduction effects.
  • Almighty Immunity [Passive]: Immune to [Stun], [Freeze], [Sleep], [Provoke], [Block Cooldown Skills], [Fear], and [True Fear] debuffs. Also immune to HP exchange effects, HP balancing effects, and cooldown-increasing effects.
  • Almighty Strength [Passive] Damage from skills that scale based on enemy MAX HP cannot exceed 10% of the boss’ MAX HP when attacking the boss. Poison Effects are 90% less effective.
  • [Ironbrand] The Ironbrand debuff does nothing on its own, but it will increase the damage dealt by the Iron Twins’ Doomsday Machine skill. Damage from this skill is increased according to the duration of any Ironbrand debuff, the greater the damage that Doomsday Machine will do. Ironbrand cannot be blocked or removed, but it can be resisted.
  • [Growth Effect] Every time Fires of Insantiy or Ruinous Swath skill is used, the Iron Twins’ DEF will be increased by 2.5%, plus an additional 1% for every enemy whose Affinity does not match the Iron Twins’. The Iron Twins will not use this skill when their HP is below 40%.

Iron Twins Guide

Iron Twins Speed, Accuracy, Resistance Requirement

There are 15 stages to complete and you ideally want to be farming the highest stage you can farm. To be successful, aim for:

How much Speed required to go before Iron Twins?

  • Stages 1-6: 150+ Speed to go before Iron Twins
  • Stages 7-12: 220+ Speed to go before Iron Twins
  • Stages 13-15: 250+ Speed to go before Iron Twins

How much Accuracy required to inflict debuff on Iron Twins?

  • Stages 1-6: 150+ (100 if you bring 50% Increase Accuracy)
  • Stages 7-12: 275+ (183 if you bring 50% Increase Accuracy)
  • Stages 13-15: 375+ (250 if you bring 50% 10Increase Accuracy)

How much Resistance required to avoid debuff from Iron Twins?

  • Stages 1-6: 205+ (102 if you bring 50% Decrease Accuracy)
  • Stages 7-12: 355+ (177 if you bring 50% Decrease Accuracy)
  • Stages 13-15: 505+ (252 if you bring 50% Decrease Accuracy)

How much Health and Defense to survive Iron Twins attack?

  • Stages 1-6: 25K Health and 2400 Defense
  • Stages 7-12: 40K Health and 2800 Defense
  • Stages 13-15: 50K Health and 3500 Defense

How to beat Iron Twins Fortress?

  1. The Iron Twins are a powerful threat that requires management of both debuffs and your Champions’ Affinities if you want to come out on top.
  2. The key to success in this fight is dealing with the Iron Twins’ unique debuff, [Ironbrand], and adjusting your team to account for the current Affinity of the Iron Twins, as it changes each day.
  3. [Ironbrand] does nothing on its own, but one of the Iron Twins’ skills, Doomsday Machine, deals damage to all Champions based on the duration of any [Ironbrand] debuffs currently on them. The longer you have left on an [Ironbrand] debuff, the more damage Doomsday Machine will do – so you need to manage [Ironbrand] carefully if you wish to survive.
  4. [Ironbrand] cannot be blocked or removed, but it can be resisted, so building your Champions to have high Resistance can make the difference between success and failure.
  5. Two of the Iron Twins’ skills, Rulnous Swath and Fires of Insanity, apply or extend [Ironbrand] debuffs on your Champions, based on their ATK or DEF respectively. The higher a Champion’s ATK or DEF is, the more turns of [Ironbrand] they’ll receive from these skills.
  6. Not only that, but the Iron Twins will increase their own ATK or DEF each time they use these skills. If that’s not enough, the Iron Twins gain additional boosts to their ATK or DEF whenever they use these skills based on how many Champions have an Affinity different to theirs – so your Champions’ Affinities are incredibly important. You might think building a team with an Affinity that counters the Iron Twins will make the battle easier but it actually means they get even stronger, even faster.
  7. With time being against you in this fight, you want to bring Champions who can deal heavy damage quickly. The longer you leave the Iron Twins alive, the longer your [Ironbrand] debuffs will last and the higher their ATK and DEF will get. You’ll want to stick to dealing damage with single—hit skills too, as the Iron Twins take 50% less damage from each subsequent hit of multi-hit skills.
  8. The Iron Twins also take reduced damage from [HP Burn] debuffs, but while these debuffs are less effective than usual, they are still a good tool to help you take the Twins down.
  9. When the Iron Twins’ HP drops below certain numbers, they’ll remove all debuffs placed on them and launch a devastating missile barrage at all Champions, so be prepared to deal with this retaliatory strike. You’ll also want to be careful when applying buffs to your team, as the Iron Twins will fill their Turn Meter by 10% each time you receive a buff. You can counter this Turn Meter fill by placing a [Decrease SPD] debuff on them, but they are immune to having their Turn Meter depleted or stolen.

Iron Twins Stats

Iron Twins Fortress Stats in Dungeon Stage 1 to 15 - Raid Shadow Legends

Iron Twins Strategies

Iron Twins Fortress Champion Tier List

Champion by Rarity: Legendary | Epic | Rare | Uncommon | Common

Mythical Champions Ranking

5★ Iron Twins | Mythical Champion

4★ Iron Twins | Mythical Champion

3★ Iron Twins | Mythical Champion

2★ Iron Twins | Mythical Champion

1★ Iron Twins | Mythical Champion

Legendary Champions Ranking

5★ Iron Twins | Legendary Champion

4★ Iron Twins | Legendary Champion

3★ Iron Twins | Legendary Champion

2★ Iron Twins | Legendary Champion

1★ Iron Twins | Legendary Champion

Epic Champions Ranking

5★ Iron Twins | Epic Champion

4★ Iron Twins | Epic Champion

3★ Iron Twins | Epic Champion

2★ Iron Twins | Epic Champion

1★ Iron Twins | Epic Champion

Rare Champions Ranking

5★ Iron Twins | Rare Champion

4★ Iron Twins | Rare Champion

3★ Iron Twins | Rare Champion

2★ Iron Twins | Rare Champion

1★ Iron Twins | Rare Champion

Uncommon Champions Ranking

5★ Iron Twins | Uncommon Champion

4★ Iron Twins | Uncommon Champion

3★ Iron Twins | Uncommon Champion

2★ Iron Twins | Uncommon Champion

1★ Iron Twins | Uncommon Champion

Common Champions Ranking

5★ Iron Twins | Common Champion

4★ Iron Twins | Common Champion

3★ Iron Twins | Common Champion

2★ Iron Twins | Common Champion

1★ Iron Twins | Common Champion

Mythical Champions Ranking

5★ Iron Twins | Mythical Champion

4★ Iron Twins | Mythical Champion

3★ Iron Twins | Mythical Champion

2★ Iron Twins | Mythical Champion

1★ Iron Twins | Mythical Champion

Legendary Champions Ranking

5★ Iron Twins | Legendary Champion

4★ Iron Twins | Legendary Champion

3★ Iron Twins | Legendary Champion

2★ Iron Twins | Legendary Champion

1★ Iron Twins | Legendary Champion

Epic Champions Ranking

5★ Iron Twins | Epic Champion

4★ Iron Twins | Epic Champion

3★ Iron Twins | Epic Champion

2★ Iron Twins | Epic Champion

1★ Iron Twins | Epic Champion

Rare Champions Ranking

5★ Iron Twins | Rare Champion

4★ Iron Twins | Rare Champion

3★ Iron Twins | Rare Champion

2★ Iron Twins | Rare Champion

1★ Iron Twins | Rare Champion

Uncommon Champions Ranking

5★ Iron Twins | Uncommon Champion

4★ Iron Twins | Uncommon Champion

3★ Iron Twins | Uncommon Champion

2★ Iron Twins | Uncommon Champion

1★ Iron Twins | Uncommon Champion

Common Champions Ranking

5★ Iron Twins | Common Champion

4★ Iron Twins | Common Champion

3★ Iron Twins | Common Champion

2★ Iron Twins | Common Champion

1★ Iron Twins | Common Champion

Mythical Champions Ranking

5★ Iron Twins | Mythical Champion

4★ Iron Twins | Mythical Champion

3★ Iron Twins | Mythical Champion

2★ Iron Twins | Mythical Champion

1★ Iron Twins | Mythical Champion

Legendary Champions Ranking

5★ Iron Twins | Legendary Champion

4★ Iron Twins | Legendary Champion

3★ Iron Twins | Legendary Champion

2★ Iron Twins | Legendary Champion

1★ Iron Twins | Legendary Champion

Epic Champions Ranking

5★ Iron Twins | Epic Champion

4★ Iron Twins | Epic Champion

3★ Iron Twins | Epic Champion

2★ Iron Twins | Epic Champion

1★ Iron Twins | Epic Champion

Rare Champions Ranking

5★ Iron Twins | Rare Champion

4★ Iron Twins | Rare Champion

3★ Iron Twins | Rare Champion

2★ Iron Twins | Rare Champion

1★ Iron Twins | Rare Champion

Uncommon Champions Ranking

5★ Iron Twins | Uncommon Champion

4★ Iron Twins | Uncommon Champion

3★ Iron Twins | Uncommon Champion

2★ Iron Twins | Uncommon Champion

1★ Iron Twins | Uncommon Champion

Common Champions Ranking

5★ Iron Twins | Common Champion

4★ Iron Twins | Common Champion

3★ Iron Twins | Common Champion

2★ Iron Twins | Common Champion

1★ Iron Twins | Common Champion

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16 thoughts on “Iron Twins Fortress Dungeon Guide | Raid Shadow Legends

  1. BTTest001

    Got second Demytha and need to correct myself: IF Demytha is 251+ speed and Pain Keepers are 206-209, Demytha need to have -1 CD in A3.

    All 4 Pain Keepers are now rank 6, Demytha is only lvl 40.
    Best non-void time is 15 min, best void time is 13 min.
    All gear is bad, only goal was to get speeds. On next free gear removal perhaps i will switch to high damage gear and perhaps use 2 champions in deflection sets to see if that give better time.

  2. BTTest001

    Team and time report:
    2nd Pain Keeper is now lvl 60 with with Warmaster, Sniper and Master Hexer masteries and one Pain Keeper is ranked up from 3* to 5* because i got one more revenge amulet. Also i got Dwarven revenge ring for Demytha and one 1* soul for Pain Keeper for some minimal damage bonus from that.

    Its ~25-27 minutes on Void affinity and ~28-30 minutes on other affinity.

  3. BTTest001

    I want to report my IronTwins team because that team is not listed anywhere.
    I don’t make videos and if someone want to make video showing this team, pls do as this is unique team working 100% on all affinity and all dungeon lvl’s.
    Sorry for my bad English!

    I use 4 Pain Keepers and Demythia, Pain Keepers need to have fully booked A3, Demythia don’t need any books for this purpose. Gear is Toxic Set and Retaliation Set and as much Revenge accessory as posible. All Champions use only A3 and only way to do some damage is counterattack. When Demythia use A3 that is 10 bufs on team = 100% TM boost Iron Twins and because of that boss is always playing after Demythia on lower dungeon lvl’s. Pain Keepers reset CD of team and all is repeated until boss is killed.
    Speeds of Pain Keepers are 206-209, Demythia needs to be 251+ (don’t know max speed that is working, for me Demythia is 253).

    Below is many text with details for my specific team that is far from full build:
    ATM i need ~40-45 minutes (~1200-1300 turns) to beat lvl 15. Demythia is part of my CB team with 293 speed in that team, when i remove one piece of speed set she loose 40 speed and fit this team but no counterattack gear or accessory and zero damage here. Tested once with one Retaliation Set, she was ~400k damage in that test. That was similar to damage of rank 3 lvl 10 Pain Keeper so i don’t spend silver to put her in Retailation.
    4 Pain Keepres are:
    Lvl 60 with Warmaster, Sniper and Master Hexer masteries and with Revenge ring and amulet, this one is MVP, always 1,5M+ dmg. Master Hexer does increase Poison duration from Toxic set!
    One rank 5, lvl 50, no masteries at all, Revenge ring and amulet, this is 2nd in dmg.
    Two rank 3: lvl 15 and lvl 10, no masteries and not ranked up because i don’t have anymore Revenge accessory for that faction.
    No Phantom Touch on any champion and only blessing i have is Cruelty on Demythia but not working here because she is not counterattacking.

    I am f2p playing little above 1 year and i am extremely happy even with 40 minutes on lvl 15 with 100% working rate, but here is my calculation how fast this team can be:
    If all 5 champions are rank 6 with Warmaster, Sniper and Master Hexer masteries and full Revenge accessories its probably around 10-12 minutes fight, with Phantom Touch on all and with some relic probably can go down to 7-8 minutes with this team.

    Will report time needed from time to time, when i get some more Revenge accessory and or when i rank up Pain Keepers.

  4. MiracleMan1Half

    hi, if im reading the bottom part correctly then it is saying the loki has only 1/5 for iron twins but after everyone dies i solo finish with lvl 60 loki (5 red stars 1 purple) and with brimston
    all skills lvl 1 so why is he so low (btw i can get to stage 4 so far)

  5. Vinny

    Just curious – I use Rathalos to inflict some serious damage on Iron Twins to synergize with Geomancer; especially with that A2 & the bonus damage on the passive with the burn (except against spirit affinity) my question is why only the 2 stars for him? I’d say I have a 90% + success rate on floor 15, and 100% on floor 14.

  6. Shaka Zulu

    A cool free to play team you can use for Iron Twins is

    Mithrala, Geo, Scyl(a2 off), Adelyn, Arbiter. Any other reviver will do. Maybe a buff extension

    I’m running Duchess, Mithrala, Stag Knight(a2 off), Geomancer and Godseeker for all affinities.

    If you don’t have Duchess you can use Scyl.

    The boss is easier more than ever

  7. Ayumilove Post author

    @Shaka Zulu: Sure thing, will be updating all of these dungeons soon 🙂

  8. Shaka Zulu

    Ayumi can we please have the updated nerfs to the boss pleaaaaaassssse

  9. LP

    Answers to previous questions:

    Apothecary – 3★ Iron Twins | Rare Champion

    Ixlimor – 4★ Iron Twins | Legendary Champion

    Roshcard – 5★ Iron Twins | Legendary Champion

    Helicath – 5★ Iron Twins | Legendary Champion

    Maulie – 1★ Iron Twins | Legendary Champion

  10. Ayumilove Post author

    @Leon Smigielski: I have added Maulie Tankard to the Iron Twins list. Thanks for highlighting it! There are many more champions that needs to be populated, this will take some time to cover all of them.

  11. Leon Smigielski

    I am just curious as to why Maulie Tankard doesn’t appear in the list??

  12. Sarella Sand

    Helicath is missing from the list :O

  13. LazarouDave .

    Where do Tyrant Ixlimor and Roshcard the Tower fall on this list, there are so many missing names.

    If they don’t appear, are they just that bad that you may as well ignore them?

  14. cz5gifts Cheryl

    Hi Ayumi!!!

    I am a dedicated reader of your most wonderful information, without which I would never be where I am in the game. My most humble and appreciative thanks to you, you perform an amazing service for all players.

    My question, what category does Apothecary fall in Iron Twins? Either I am blind (most likely) or he isn’t on here. Once again, thank you!!!

  15. iSimpforArbiter

    Ayyyy, update! Thank you very much Ayumi for your continuous and hard work; I recommend everyone who asks questions about the game to this site (since can’t help ya much otherwise :c, no money no honey). Currently haven’t played the game for while, but I’ll get back to it eventually- sometime…

  16. LoneDragon

    Gnishak is 3 star, right? He’s 3 star on his page but not on this list.