It was pretty easy to get to Delve lvl 8, sure you’re super squishy but if Brann is your dedicated healer, there really isn’t anything to worry about.
I play assassination/death stalker and it can get pretty rough. But we sort of can cheat by using threat redirection (tricks of the trade) on Brann set as a healer. It makes it way easier. We can also bypass unnecessary trash packs with stealth.
The only issue is Brann can sometimes run around when he has agro, which can complicate some fights where placement is needed.
I did some delves on my mage and it was way easier if I’m being honest. Just kite around and have Brann in DPS mode.
I don’t see how Zekvir ?? Is possible as assassination, though. At least not at my crummy iLevel. I do 1M DPS single target raid buffed and I can’t get him past 50%. Even if I interrupt every carapace and avoid every AoE and kill the egg in time… just melee swings and poison dots wipe me out. And that’s if I get lucky on placement.