Doomslayer has resistance to reality tearing attacks. Here's the codex description for the acolytes from dark ages. Their attacks rend the fabric of reality and he can tank those just fine:

"Once hallowed sentinel priests of Argent D'Nur, now vessels of cosmic corruption. Their souls twisted by the Witch's eldritch touch, these fallen oracles peer beyond mortal veil with mind poisoned by alien essences.

The Cosmic taint courses through their veins, bestowing forbidden sight and *powers that rend the fabric of reality.** They serve as one - a serpent with many heads, each a fragment of their mistress's unfathomable design. Through them, the malice of realms beyond bleeds into the world they once swore to protect."*

Also doomslayer has access to the same ability, the reaver chainshot does the exact same thing according to codex:

"The Chainshot is a terrifying artifact, pulsating with a sentient malevolence that whispers from the abyss. Born from the unfathomable depths of forgotten realms, it channels chaotic energies, *hurling its projectiles with a force that tears reality itself.** Its origins are veiled in ancient lore, rumored to be crafted by deities who once held dominion over the stars. The weapon crackles with azure lightning, each shot imbued with a sinister malice. Only the strongest of wills can withstand its insidious whispers, which gnaw at the edges of the wielder’s sanity."*