Anyone else stealth this 3BC quest Old Tomb, New Tenants? I completed it on EH with 7 kills. Kyrnxala, the red-named boss near the very end, is the only required kill in order to get through the locked underwater door to final chest. Until then, all levers can be opened through stealth tactics without engaging any mob. Very fun! Devs please do not change this, as one of the most awful mechanisms in the game are levers that only activate after all mobs in area are dead.
Final chest room after killing Kyrnxala: the chest remains locked until after you kill the pirates that drop in after entering (grrrr. . .otherwise this could be a one-kill quest like Claw of Vulkoor). On EH this was 6 Pirates. I reached this point on EE but was not prepared for the pirates and could not get past them (but then am level 26 and am working on new destiny).
Tactics for Kyrnxala: stealth out enough near her for her threatening dialog to begin. Stealth back to entrance of that area where there is a platform, before the catwalk/bridge begins. If EE, shut the door so no mobs will come in once fight starts with her (this will deny access to the nearby shrine, though). Hit her with ranged weapons so that she comes to the platform area by door. This will prevent you needing to fight her mobs of Yuanti that appear if you melee her out on the platform where she first spawns. I found that kiting her with ranged stuff was effective, since most of her attacks are area effect immediately around her--I just ran around in a circle at the entrance platform and only needed to cocoon a couple of times.
For end room, they are just pirates, so perhaps use CC stuff like Sleet Storm etc. to take them down (this is for roguish types that are looking for a scrolled spell suggestion. Some destinies can also knock them out easily enough). It is not possible to run about ranging them since a couple will be archers.
If you have done this on stealth, please post a screenie, suggestions, and/or feedback. I am always happy to find stealth quests for people who love this playstyle.