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From Pathfinder Bounty #1: The Whitefang Wyrm, which isn't enabled.

Collapsing Ice

HAZARD 0
Stealth +5
Description The ice here is weak and collapses under the weight of a Small or larger creature.

Disable DC 19 Crafting to create a makeshift device to brace the ice.


Collapse
Trigger A creature follows the false trail onto thin ice

Effect The ice collapses beneath the lead dog sled team. The dogs and sled can be rescued, but the PCs lose significant time.
Pathfinder Bounty #1: The Whitefang WyrmOGL