A buff associated with large slime-type enemies, most notably the Slime Boss. Any large slimes dropped to or below 50% health will get their turn interrupted, and will split into two smaller slimes as their new turn action.
The health of the new slimes is equal to the amount of health the parent slime had when it split, (e.g. the slime boss splitting at 60 hp will result in one Spike Slime (L) and one Acid Slime (L), each with 60 hp) and killing the parent before it can take its turn will prevent any additional slimes from being spawned.