So few things could hurt Crawler these days that Jack rarely got to see the regeneration in full effect.  Crawler’s healing powers appeared to play out in fast-forward when compared to even the regenerators who could heal wounds in seconds.  Hundreds of pounds of flesh were replaced in one or two heartbeats.

One eruption of light hit Crawler in the dead center of his chest.  It made him pause, no doubt removing one of his hearts and some of his spinal cord.  The boy with the glowing hair pushed his power into overdrive, calling forth a series of flashes that exploded in close succession.  One caught Crawler in the face, revealing only a cross-section of his head, complete with a bisected brain, a skull six inches thick and the interior of Crawler’s mouth.  Crawler collapsed.

...

Crawler’s brain grew back to its full beach-ball size in one or two seconds, followed closely after by the healing of the skull, the reappearance of his facial muscles, then his skin, hair, spines, scale and armor plating, roughly in that order.  He shook his head like a dog with water in its ears and looked around, searching for his quarry.

Wildbow, Worm, 12.x