pf2e.fyi
From Pathfinder Society Scenario #2-01: Citadel of Corruption, which isn't enabled.

Dragon's Death (1-2)

HAZARD 3
Stealth +11 (expert)
Description The pile of bones transforms into a Large silver dragon, while the PCs appear to transform into dark, shadowy figures of alien physique. The dragon's flesh appears to slowly dissolve into lines of black smoke, which trail away toward the PCs and appear to be absorbed into their bodies. Once the dragon is stripped of flesh, its skeleton explodes in a shower of bone fragments.

Disable DC 20 Religion (trained) to exorcise the spirit (two actions), or DC 23 Diplomacy (trained) to calm the spirit momentarily (two actions).

Reset 1 minute, as the bone fragments slowly move back into a neat pile with the skull on top.
Pathfinder Society Scenario #2-01: Citadel of CorruptionOGL