Abyssos is fun for tanks because Warriors can't cheese it

[dspguy]

Make invulns have a recast longer than the instance. And make them not reset upon death. Therefore, no one should rely on them for anything in content like that. Make it something infrequently used for mechanics.

[CKNovel]

Make invulns have a recast longer than the instance. And make them not reset upon death. Therefore, no one should rely on them for anything in content like that. Make it something infrequently used for mechanics.

Terrible idea.

You'd just kill one mitigation on each tanks.
If you actually mean Invuln having 120 mins and not resetting upon wipe, your idea would most likely end up in groups exiting and requeueing in the instance after each wipes.
Groups formed through duty finder wouldn't be able to use these strats and would simply be punished because of game mechanics.

And if you don't reset invuln after an instance end, imagine you had to pop it one hour ago and it's time to raid.
"Johnny, can you invuln?"
"Huh... No, I used it in a dungeon an hour ago, I still have 40 mins CD"

On top of that you would make invuln an unreliable tool to use. Might as well remove them if we would go with your idea.