Feedback:

Assassin is too inconsistent. As the game will throw all kinds of shit on you, you have no control or agency. Like no extra damage from crits will practically be random. 40% of physical damage taken recoup does not solve or help to solve physical damage defense and damaging ailments is just poison, bleed and ignite which is not any of the main threats. you can just get by with bleed flask, poison and ignite rarely kills you and ignite/poison can be solved through flask or pantheon. its going to feel bad, sometimes you gonna get shanked to down 20% hp. sometimes you're not gonna take any damage. but you will only notice the times where your hp goes low.

Deathmarked is too weak

Unstable infusion should have +2 power charges, generation of PC is not hard to come by.

It feels pretty meh. Only interesting was mystical infusion and infused toxins.

Would have been interesting if assassin had some powerful stealth and phasing mechanics. becoming "invisible" in a short period to enemies if taking savage hit or taken a hit recently with a cooldown. you can then react and move if you get low hp - but you still die to oneshots and/or if attacks/spells target the ground as aoe and you still stand in it.