Do this achievements to get the corresponding effect.
Play as Blaze: get 50 Relic items in Konquest mode to unlock this character.
Play as Daegon: get 30 Relic items in Konquest mode to unlock this character.
Play as Meat: get 10 Relic items in Konquest mode to unlock this character.
Play as Taven: complete Konquest mode to unlock this character.