User blog comment:Poisonshark/Custom Champion: Berthram, the Kingslayer/@comment-7709681-20150830201651

Doesn't sound like a "Assassin / Tank", sounds like a Brusier with and overloaded kit, too much mobility, CC, defense and damage.

An "Assassin / Tank" can exist, even Riot has stated so, the sole reason they are irked with the idea and so far haven't invested their mind in it is something very unhealthy for the game: A champion that can reliably initiate and assassinate his own targets, and get out impune.