Carl's phasing movement skill — used at level 13 to punch straight through Scolopendra's flesh and into her guts.
Gloom Wraith Phase is a movement skill of Carl's that lets him shoot forward through solid matter like a bullet. On the eleventh floor, now at level 13, he activates it to plunge himself and the harnessed pig Penelope straight through the wall of Scolopendra's body, tearing a blood-showering hole deep into the aircraft-carrier-sized centipede's interior (the wound healing shut behind them). It only reaches so far — they stop lodged in her flesh rather than in Club Scolopendra itself — forcing Carl to switch to Oozy Form to slime the rest of the way to the club wall.
A key infiltration tool in his contingency-stacked plan to reach the gods hidden inside the dungeon boss.
A phasing skill — the user rockets through solid matter as an incorporeal dark form; no fixed appearance.
Carl's phasing movement skill, used to breach Scolopendra's body from the outside.
Also appears in books you've already read — spoiler-safe to their endings: