Delver of the Depths IV

I was expecting at least some fluff in the mail if not some extra Undercoins for finishing every Delves at +11 like some other achievements did in previous expansion for similar challenging content but alas, there is nothing.

Here's my list of which story is the easiest.

Delve

Story

Info

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Missing Pigs
Fiery Grounds
Dagran's Day Out
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Strange Disturbances
Niffen Napping
Runaway Evolution

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The flamethrower can do millions in damage, so use it! Just have to clear out some webs, a gauntlet and then rescue webbed victims.
Bran as heal.
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Very short. You can stealth while rescuing the Puppets and won't trigger the mobs. (Probably the easiest to do Immortal Spelunker)
Just watch out for the illusions.
You can use the patrolling mob to help damage mobs, as well as help kill each one when you need to. (Also good for the Immortal Spelunker)

(Will update as needed)

This is the achievement for completing all Tier 11 delves with lives left.

Regarding Tier 11 Delves in War Within Season One, players even with relatively low Normal item level have the damage to complete the Delve. The core issue is that you do not have the stamina to comfortably tank or eat chunks inside of the Delve even in Mythic gear. The white hits / auto-attacks even from casters can routinely do 40% to 80% of your health pool. Certain mobs can just one shot you with melee, and casts can be deadly especially with multiple casters.

The strategy is basically:

1. Take it extremely slow
2. Try to CC with spells like Polymorph to cut down on mobs you have to fight
3. Fight mobs, one at a time ideally
4. With cooldowns, defensives and things available
5. Especially making sure you have at least a Algari Healing Potion for emergency healing
6. Kite, slow, stun and try to outrange mobs whenever possible since you'll die very quickly taking multiple auto-attacks
7. If you have to, check which Story Variant is up since some are much easier than others
8. Prioritize which mobs to kill - any Rogue style mobs tend to murder you very quickly e..g
9. Don't bother trying to level Brann - even a maxed out Level 60 Brann DPS sucks, prioritize getting Curios at Rank 4
10. If you run out of lives, you can avoid hitting the Meeting Stone, and take advantage of your infinite 0 lives, and right before completion of the Delve via the boss, hit the Meeting Stone to get back up to +1 life.

Some DPS have a much harder time than others at doing this, and I found tanks have a much easier time completing this challenge vs most DPS and healers.

You can do this in groups though I wouldn't recommend it. Having access to a Tank and Healer solves having to tank mobs, but given how hard some casts hit and how easy it is to just slightly step into a puddle and die, and given that deaths are shared and it can take a very long time to get a group, I wouldn't recommend it.

I think it is legitimately faster to get a geared tank to go through this challenge. My tank alt comfortably completed this vs my struggling DPS. Note that this is account-wide so you can spread out the challenges.

Lastly, I don't know what's going to happen come next season with Delves, whether the Delves will be entirely retuned, or simply more levels added to the Delves. When the 11.1.0 Season Two PTR comes up, we can figure out whether this achievement for Season One becomes an exclusive Feat of Strength (which means you want to rush). If not, and either Delves are re-tuned or Delve levels are added, I would just recommend leaving this achievement for later in the expansion. (If you want the challenge go for it but I don't think kiting for 30s is interesting, and Zekvir is a better and more fun challenge than this )