The Eternally Hungry Caterpillar: Init +2; Atk bite +6 melee (3d6); AC 17; HD 8d12 (starting); hp 96 (starting); MV 40’; Act 1d20; SP consume; SV Fort +12, Ref +2, Will +20; AL C.
Consume: When the Eternally Hungry Caterpillar brings a foe to 0 hp, the Caterpillar can spend 1d3 + victim's HD rounds to utterly consume the body. Each time it does this it grows, gaining 1 HD and 8 hp per full round that it spends eating. If attacked while consuming, the Eternally Hungry Caterpillar will attempt to slay attacking foes before resuming consumption.
AND IT IS STILL HUNGRY!