Deception Dragon

The Deception Dragon (Or Shadow as more of an elemental theme) is disguised as another random elemental dragon before spawning and up until it is engaged, at which point it shows its true form. During the fight champions in the aoe of its breath attacks are randomly disguised as other champions until they attack or use an ability. The team that kills the Deception Dragon can use an activated ability out of combat to disguise themselves as another allied champion, which breaks when they attack or use an ability. More dragons lowers the cooldown of the active.