Why is Abyssal Wraith Invulnerability still in this game?!

I triple juiced abyss tablets on a T15 map and those mfers take forever to kill.

I have 47% chaos resist, 6400 shield, 1400 life and the green flame thrower one 1 shot me from off screen. I killed a bunch just fine but if they catch me off guard or on a bad map i'm dunzo.

I came across another Rare that was even more abominable with the array of tons of ice darts, spamming them with red exploding lightning stuff, on the reaper with bleed that turns into bats. an absolute abomination.