|This spell transforms one creature into a pulsating mass of flesh. Works on natural monsters only.|
Cigotuvi's Degeneration is a level 5 Transmutations/Necromancy spell which turns an enemy into a pulsating lump, a slow, weak monster with a mutation-inducing melee attack. The spell requires a clear line of fire, checks magic resistance, and only works on natural monsters.
This is a safer choice than Polymorph Other for eliminating brutal enemies, since you know what the monster will turn into. However, pulsating lumps are still dangerous due to their mutation attacks and worth far less experience than most monsters you would want to use this spell on.
The spell is fairly high-level, and most players who can cast it and have the free spell slots would be better off learning Agony, since the two spells work on almost exactly the same set of monsters and both check magic resistance.
Cigotuvi's Degeneration was removed in 0.12