This skull is as large as an ogre and surrounded by buzzing flies. Its bat wings are too small to actually carry it, yet it moves through the air as easily as a bird. It is surrounded by the stink of rotting meat, spice, and perfume.
AC 30, touch 16, flat-footed 23 (+7 Dex, +14 natural, –1 size)
Speed 10 ft., fly 40 ft. (average)
Str 33, Dex 25, Con —, Int 21, Wis 20, Cha 22
If destroyed, the herald it returns to unlife 1 hour later at 1 hit point, allowing its fast healing to resume healing it. It can be permanently destroyed by positive energy, being reduced to 0 hit points in the area of a bless or hallow spell, or if 20 vials of holy water are sprinkled on its remains.
A creature swallowed by the herald must save every round against slay living (DC 25, caster level 15th). The soul of a creature slain by this attack becomes trapped within the herald's skull, and the mangled corpse is immediately regurgitated. The creature cannot be brought back to life until the herald's destruction (or a spell deflection—see below) releases its soul. The Maw can hold only one soul at a time. The trapped essence provides the Maw with fast healing 20, lasting 1 round for every Hit Die of the devoured soul. The trapped soul gains 1 permanent negative level for every round it spends within the Maw—these negative levels remain if the creature is brought back to life (but don't stack with any negative levels imparted by being brought back to life). A soul that is completely consumed may be restored to life only by a miracle or wish spell. The save DC is Charisma-based.
If any of the following spells is cast at the Maw and overcomes its spell resistance, it instead affects the devoured soul: banishment, chaos hammer, confusion, crushing despair, detect thoughts, dispel evil, dominate person, fear, geas/quest, holy word, hypnotism, imprisonment, magic jar, maze, suggestion, trap the soul, or any form of charm or compulsion.