necrotic burst

5-level Necromancy

You cause the cyst of a subject already harboring a necrotic cyst to explosively enlarge itself at the expense of the subject's body tissue.   If the subject succeeds on her saving throw, she takes 9d6 points of damage, and half the damage is considered vile damage (see necrotic bloat).   The subject's cyst-derived saving throw penalty against effects from the school of necromancy applies.   If the subject fails her saving throw, the cyst expands beyond control, killing the subject.   On the round following the subject's death, the cyst exits the flesh of the slain subject as a free-willed undead called a Skulking Cyst.   The skulking cyst is formed from the naked organs of the subject (usually the intestines, but also including a mass of blood vessels, the odd bone or two, and sometimes even half the lolling head).
At higher levels: When you cast this spell using a spell slot of 6th level or higher, the spell deals 2d6 more damage for each slot above 5th.