From Pathfinder Adventures: Troubles in Grayce, which isn't enabled.

Bittersweet Surprise

HAZARD 4

Stealth +10 DC 22 Arcana or DC 22 Occultism to unravel the circle's meaning without triggering its reaction.

Description A magic circle made of royal icing seals the trap door to the gristmill's basement shut and plays a nasty trick on anyone who tries to open it without all three of its gumdrop keys.

Disable If the three magical gumdrops which act as this hazard's keys are placed at the correct points of the magic circle, its enchantment is disabled. Deciphering the correct locations requires a successful DC 20 Arcana or DC 20 Occultism check; on a critical failure, the mere act of placing the gumdrops activates the Malicious Metamorphosis reaction. Once the enchantment is disabled, the magic circles can be wiped away like any regular icing.

Malicious Metamorphosis

Trigger A creature touches the trap door without first placing the three enchanted gumdrop keys in their proper arrangement

Effect The magic circles prevent the trap door from opening and maliciously transform a portion of the triggering creature's body, with effects based on the result of the triggering creature's DC 18 Fortitude save.

Critical Success The triggering creature is blown 10 feet away from the trap door and knocked Prone, but otherwise unaffected.

Success The target is blown 10 feet away from the trap door, knocked prone, and has three fingers on one of their hands transformed into gingerbread. They cannot use weapons with the two-hand or twin traits for as long as the transformation persists.

Failure As success, except the transformation also extends to the creature's entire hand and a portion of the adjoining arm. The affected creature becomes Clumsy 2 for as long as the transformation persists.

Critical Failure As failure, except the transformation also applies to one of the triggering creature's legs. For the duration of the transformation, it takes a –10-foot circumstance penalty to all of its speeds, is Slowed 1 and is Off-Guard, in addition to the effects listed above.

Reset If the trap door is closed without the magic circles being disturbed, the enchantment resumes as normal.

Pathfinder Adventures: Troubles in GrayceORC