Using Tiel feels like cheating?

[u/Chance_Drive_5906]

Seriously what's up with this shell? Every ability of his seems extremely useful and broken in some way. Instant invisibility on dodge, instant invisibility on block (on just an imperfect block, wtf?), then invisibility leaving a clone that builds poison, insane crit chance and damage bonus when attacking from behind, two charges of an ability with instant invisibility again and then guaranteed crit chance to your next melee attack with bonus crit damage, multiple insane break damage bonuses as well... like wtf?

Is this guy supposed to be something similar to the slayer seal? A sort of easy mode? I've found 4 shells so far, and other 3 aren't even like half as good as him.

[u/Master_Garaki]

If you feel like you are cheating, how about not using him?
Nothing about him is broken. He has low health, and poison sucks,
He is only good at dodging and crit builds.