In order to determine if something is edible, the vermilion pudding can sense heat and vibration from a distance of up to 90 feet. The vermilion pudding will even attack undead creatures that have organic matter in their bodies. Vermilion puddings prefer to attack Legacy-using creatures and will attack Inheritors before attacking those with a single Legacy. Like all deadly puddings, the vermilion pudding is immune to acid, cold, and poison. Lightning bolts and weapon attacks cause them to divide into smaller puddings, each able to attack as an individual pudding.
Fire causes normal damage, as do magic missiles.
All vermilion puddings are at least three feet in diameter. The attack mode of the rapacious vermilion pudding is similar to that of the vermilia infection, except much faster. If the pudding successfully hits an opponent once, it automatically succeeds each subsequent round until it is destroyed. Armour provides little protection from the vermilion pudding's attack since the pudding only has to touch its victim. All of its victims have a base of AC 10, although magical armour bonuses, magical protection such as a ring of protection , and dexterity bonuses are still applicable.