Champion perma-death idea
I like the current champion injury-death system. But wouldn't it be interesting if the assassin path had a high-level ability that allowed them to do a "killing strike?" It could have a high cooldown to prevent spamming, but if it hit it caused perma death on champions (not sovereigns).
The Path of the assassin is good, but seems like it needs some extra differentiation (to me).
The problem I see with this is if Altar's twenty henchmen all pick this ability...but that's more a problem with henchmen than this idea.