Black Hole
The dozen or so that had initially risen from the sea of blood now numbered close to a hundred, surrounding him completely. There wasn't much time to think of what the workaround to the "hydra"-like multiplication of the skeletons was, if there even was a weakness to it to begin with.
Trying to bide time as he thought, the miasmic skeletons drew close—reaching towards him with smoke that rose from their deathly bones like a plague.
"Back!"
With a stomp of his feet, the swamp of blood rippled and a shock wave emitted, blasting the numerous skeletons back. Even though he was merely trying to create space and not break them again, they shattered and rebuilt into higher numbers once more.
A brief sigh left his lips as he found himself totally surrounded by the blackened bones, engulfed in the stench of charcoal that swept through the bloody, white void.
'It's endless,' he thought.