Do Not Try This At Home... Or Do (Kakeru)

The scraping continued, until it reached the end of the adjacent aisle ahead of them. It turned a corner, and a beast that looked humanoid walked into view. Instead of normal limbs, it had tentacles, the top ones tipped with some kind of bio metallic blade. It's skin was bleached white, and it had no head to speak of.
"Oh gods, a Reaver..." Salem muttered. "This is far worse than I thought."
It stopped, turning to face the trio. Set into it's torso, directly below where the base of the neck would be, were a pair of holes that expanded and contracted rhythmically, as if it were breathing.

"If the failure called forth a Reaver, I think I can tell what kind of spell she was casting." Salem said. "Kakeru, we must be going. Before it catches our scent."
The two holes began fluctuating rapidly, before it slung a single bladed tentacle at Gae Bolga. The limb stretched to an amazing length as it traveled.

"He has a point, Kakeru. Let's move before any more Reavers appear." Salem said, leaping up and climbing through a shelf to the next aisle.

The Reaver used it's extended arm to pull itself toward Doppelganger quickly, swinging with its other bladed tentacle.
Salem began seeing shelves bent out of shape, and jumped back down to the floor, the only partially even surface left. As he drew closer to the epicenter, even it became semi-liquid, and he resorted to floating across.

The Reaver's elastic skin gave for a moment under the blade, before the weapon passed right through the creature, causing it to vanish into a cloud of eldritch dust.
Salem finally saw a bubble of light, vaguely human-shaped. "There."

Salem whipped his head around. "Kakeru, you deal with Claudia." He zipped off, trying to remember a mana-siphoning spell.
The bubble didn't move, and a human figure was barely visible inside. It reacted to Kaki's touch, beginning to part before fixing itself.

Salem began chanting in a language lost even in time immemorial, his body glowing. He transformed into a warrior clad in shining gold armor, armed with sword and shield, and stood, waiting for the Doppelgänger.
The bubble parted to Kakeru's touch, eventually allowing him access to the person inside. When Kakeru touched her, the bubble vanished, the blonde woman inside slumping back. The Warehouse began to correct around them slowly.