Grail Mud Healing

Once the black mist cleared, it revealed Alkeides atop his horse, with the spear thrust into his left arm.
...
His wound, however, was far from lethal. Despite the fact that the spearhead was still embedded
between his bones, the dark red “mud” was already squirming out to fill the wound.
“. . . Alkeides . . . what are you carrying inside you?” Hippolyte asked, her face growing grim
and her right hand still gripping her spear. “What is that ‘mud’?”
Because her spearhead was still stuck into Alkeides, they were naturally forced to continue riding in parallel. As Hippolyte, seeing the “mud” oozing from her opponent’s wound, hesitated to pull back her spear for a moment, the bow swung by Alkeides’ right hand bit into her side.
With a grunt, she hurriedly blocked it with divine energy from the belt, but the force of the blow pulled her spear free and put distance between the two horses again.
Alkeides checked that the mud had staunched his wound once the spear was removed, then casually declared:
“. . . Who can say? But given that it adapts to my current form . . . it’s probably part of a
‘human.’”

-F/sf Vol 6

Alkeides’ side was eaten away by the venom, melting into a black wound before John’s puzzled gaze...
But an instant later, the jet-black toxin was consumed by “mud” of an even more sinister hue.
“What?!”
The police officers, Flat, and the Berserkers froze in spite of themselves.
The mud-like mass of magical energy that welled up from Alkeides’ body enveloped the Hydra venom as if to consume it, to consume “death” itself, and was then sucked back into the wound.
“If I had merely thrown off the robe of godhood, I would have suffered and then gone to my rest.”
The poisoned wound that had eaten so deep it exposed his ribs and hipbone vanished, leaving his body fully restored in its place.
“Before my Spirit Origin was twisted, I would have been willing to fall to that scratch. This venom alone may have been able to eat through all of my countless lives.”
Then, he stood before the speechless John and declared:
“But... we have both been unfortunate.”

-F/sf Vol 5