Hunting the Hunter

Rewards the title "Ascension Breaker"

Edit: As of the hotfixes on Sept 13th, Brann seems to deal significantly reduced damage in this delve and there seems to be some weird scaling and damage issues.
Edit 2: As of the hotfixes on Sept 26th, Zekvir's lair has had significant nerfs. I have updated the info below for accuracy.

Thought I'd write a bit of a guide/info thread for those who are looking to attempt this.

Zekvir is a pseudo end-boss for season 1 of the new Delves feature introduced in The War Within. He is located in the 'hidden' 13th Delve called Zekvir's Lair, which is found in the western-most section of the City of Threads in Azj'Kahet.

There are two modes for Zekvir. A normal mode, called Tier ? and a hard mode, called Tier ?-?. To unlock Tier ? and access to the delve, you need to beat any delve on tier 8 with lives remaining. To unlock Tier ?-? you need to beat any delve on tier 10 with lives remaining. The My First Nemesis achievement is awarded for beating Zekvir in the normal mode Tier ? difficulty, either on your own or in a group. The Hunting the Hunter is awarded for beating Zekvir on the hard mode Tier ?-? difficulty, either on your own or in a group. The Let Me Solo Him: Zekvir is awarded for beating Zekvir on the hard mode Tier ?-? difficulty whilst solo only.

The delve itself has no trash or other enemies whatsoever. You walk in, there's a room to prepare Brann, then you unlock a door and Zekvir is right in front of you in the next room.

For reference, on Tier ? difficulty, Zekvir has around 81M health (when solo) and has 5 abilities.
- Angler's Web is a narrow frontal cone aimed at his current target that grips you in and deals damage (can be dodged)
- Claw Smash is a wide frontal cone aimed a you or Brann that deals massive damage (can be dodged)
- Horrendous Roar is 15 yard AoE around the boss that deals damage and fears you for 4 seconds if you are in the circle when the cast finishes (move out)
- Enfeebling Spittle is an interruptable cast that puts a 20 second DoT and slow on you that trucks your health. Note - this is a magic effect and a snare, so can be magic-dispelled or can be removed by abilities that remove snares (eg: Warlock Teleport).
- Call Web Terror summons a cocoon with 4.3M health (when solo) that will hatch into a spider if not killed in 20 seconds. The spider will repeatedly cast a 5 second stun on you, which is interruptable/cc-able. The spider spawns with the same percentage the cacoon had, but has more health overall.

On Tier ?-? difficulty, Zekvir is juiced. He now has 182M health (when solo) and his abilities from Tier ? have been tweaked to make them more difficult.
- Angler's Web cast time is reduced and this will now one-shot.
- Claw Smash cast time is reduced and this will now one-shot.
- Horrendous Roar now deals a significant amount of damage, most-likely one-shotting you.
- Enfeebling Spittle damage is significantly increased and will most-likely kill you if not removed or a defensives rotated.
- Call Web Terror's cocoon has has significantly more health (9.8M health when solo) and spiders now spawn at full health.
As well as the above, Zekvir gains one new ability in Tier ?-?
- Regenerating Carapace heals Zekvir for 10% of his maximum health if not interrupted.

On Tier ?-?, Zekvir now has a phase 2 at 60%. He will run to the centre of the room and start a 10 second cast which also makes him take 99% reduced damage. Once this cast finishes, 2 of his abilities are empowered and he gains 2 new abilities.
- Horrendous Roar becomes Infinite Horror and if hit will fear you indefinitely (you will probably die to the damage anyway).
- Regenerating Carapace becomes Blood-Infused Carapace and now heals Zekvir for 25% of his maximum health if not interrupted.
- Unending Spines is a new ability that causes spines to erupt from swirlies on the ground dealing massive damage, most-likely one-shotting you (keep moving and dodge them).
- Angler's Web works slightly differently. Zekvir will now summon void portals around him and will fire Angler's Web into one of them, instead of at his current target. The Angler's Web will then travel between all of the portals hitting you in you are between the portals. Do not get caught out standing between the portals (just move out as you do with with the fear).

-- Note - When solo, the cooldowns of Enfeebling Spittle, Renenerating Carapace and Blood-Infused Carapace are altered to better match available class interrupts.

Good luck!

thank you friend this is the info i was looking for :)