RAID: Shadow Legends Champion Fusion feature can be found in the Summoning Portal which allows players to fuse multiple champions to create a powerful champion of a higher rarity.
Relickeeper (Epic)
Requires: Lv.40 Justiciar + Lv.40 Executioner + Lv.40 Templar + Lv.40 Sorceress
Lv.40 Justiciar = Lv.30 Warmaiden + Lv.30 Diabolist + Lv.30 Spirithost + Lv.30 Heiress
3* Sorceress = Obtained from Campaign 3 “Catacombs of Narbuk” OR Mystery~Ancient Shard
3* Spirithost = Obtained from Campaign 4 “Durham Forest” OR Mystery~Ancient Shard
3* Heiress = Obtained from Campaign 6 “Palace of Aravia” OR Mystery~Ancient Shard
3* Diabolist = Obtained from Campaign 12 “Brimstone Path” OR Mystery~Ancient Shard
3* Templar = Obtained from Campaign 8 “Valdemair Strait” OR Mystery~Ancient Shard
3* Warmaiden = Obtained from Campaign 9 “The Deadlands” OR Mystery~Ancient Shard
3* Executioner = Obtained from Campaign 11 “Hallowed Halls” OR Mystery~Ancient Shard
Rhazin Scarhide (Legendary)
Requires: Lv.50 Lich + Lv.50 Erinyes + Lv.50 Bloodfeather + Lv.50 Torturehelm
4* Lich = Lv.40 Magus + Lv.40 Marked + Lv.40 Rocktooth + Lv.40 Penitent
4* Erinyes = Lv.40 Raider + Lv.40 Gnarlhorn + Lv.40 Valerie + Lv.40 Wanderer
4* Bloodfeather = Lv.40 Slitherbrute + Lv.40 Goremask + Lv.40 + Lv.40 Channeler
4* Torturehelm = Lv.40 Skullsworm + Lv.40 Halberdier + Lv.40 Spikehead + Lv.40 Theurgist
Broadmaw (Epic)
Requires: Lv.30 Arbalester + Lv.30 Stoneskin + Lv.30 Huntress + Lv.30 Bloodhorn
3* Arbalester = Lv.30 Commander + Lv.30 Hardscale + Lv.30 Dhampir + Lv.30 Satyr
3* Stoneskin = Lv.30 Jaeger + Lv.30 Brute + Lv.30 Warchanter + Lv.30 Militia
Alika (Epic)
Limited-Time Fusion Event 2019-10-09 (Can only be fused 1 time)
Requires: Lv.40 Ogryn Jailer + Lv.40 Ghoulish Ranger + Lv.40 Perforator + Lv.40 Reliquary Tender
3* Ogryn Jailer = Champion Training Event (Requires 900 points)
3* Ghoulish Ranger = Champion Training Event (Requires 5100 points)
3* Perforator = Champion Chase Tournament (500 points)
3* Reliquary Tender = Champion Chase Tournament (750 points)