From Pathfinder Adventure: Rusthenge, which isn't enabled.

Severed Head

CREATURE -1

Variant severed head

The most common beheaded appears simply as a rotting head, barely preserved by the magic that created it.

Beheaded are the reanimated heads of decapitation victims. These mindless undead fly through the air or roll around to attack their prey.

Perception +6; darkvision

Skills Acrobatics +6 (+8 to Maneuver in Flight)

Str +1, Dex +2, Con +0, Int -5, Wis +2, Cha +0

AC 15; Fort +4, Ref +6, Will +4

HP 7, void healing; Immunities bleed, death effects, disease, paralyzed, poison, unconscious; Weaknesses vitality 1

Void Healing

A creature with void healing draws health from void energy rather than vitality energy. It is damaged by vitality damage and is not healed by vitality healing effects. It does not take void damage, and it is healed by void effects that heal undead.

Speed 15 feet, fly 25 feet

Melee Jaws +6 (agile, finesse, unarmed), Damage 1d4+1 piercing plus Rust Creep

Gnash

Requirements The beheaded's previous action was a jaws Strike that dealt damage to its target.

Effect The severed head makes a second jaws Strike as it violently shakes itself, trying to rip away a mouthful of flesh. On a success, the target takes an additional 1d4 slashing damage and 1 persistent bleed damage and is exposed to rust creep.

Rust Creep (disease, divine)

These undead inflict rust creep with their jaws Strikes. A creature damaged by a jaws Strike or a Gnash from one of these severed heads must succeed at a DC 15 Fortitude save or contract rust creep.

Those afflicted by rust creep develop uncomfortable rust-colored bruises on their flesh and endure full-body aches like those one might experience after a long workout. As the affliction progresses, their bodies—as well as the clothing and items they wear or carry—increasingly break down until a painful death occurs. If a character successfully resists contracting rust creep, or recovers from a case of rust creep, they are temporarily immune to future rust creep infections for 24 hours.

Rustcreep

Saving Throw DC 15 Fortitude

Stage 1 –1 status penalty to Athletics checks (1 day)

Stage 2 as stage 1 (1 day)

Stage 3 Enfeebled 1 (1 day)

Stage 4 enfeebled 1 and Stupefied 1, plus any armor, clothing and items you carry and that are of a level equal to or less than the disease become broken as the decay spreads to them (1 day; broken items remain broken)

Stage 5 Unconscious (1 day)

Stage 6 unconscious (1 day)

Stage 7 death

Pathfinder Adventure: RusthengeOGL