Flash Flood

Requirements

The PCs are in a hex that contains hills, mountains, or a river.

Survival DC 27 (expert)

Preparation

DC 21 Survival (trained) to move to high ground before the flash flood hits.

Routine (1+ hours) The rushing waters of the flood surge through the area with shocking speed. The PCs roll initiative with Perception or Survival checks; determine the flash flood's initiative by rolling 1d20+17. On a PC's turn, they can attempt to move out of the flood's path. This could be as simple as taking Strides to get out of the way, or this could be complicated by having to succeed at a DC 25 Athletics check to climb to safety. You can also complicate escape by having the width of the flood area be more significant, to an extent that even three Strides might not be enough to escape. On the flash flood's turn, it attempts to Sweep Away any PCs who haven't escaped its path.