Skystone Field
Hazard
Level 19 Lurker
XP 2400

With a resounding crack, a chunk jettisons from the surface beneath you and rockets upward.

Hazard: When this hazard is triggered, bits of a solid horizontal surface shoot upward, potentially taking creatures with them. The hazard occupies an area at least 10 squares on a side; random squares within the area attack.Perception     DC 22: The character notices an array of cracks running throughout the surface and sees that certain blocks bounded by the cracks twist and shudder.Nature     DC 27: As Perception, above.Initiative +2TriggerThe trigger for a skystone field can be random, caused by the actions of creatures, or timed. When the field is triggered, it rolls initiative. Between the triggering of the field and its attack, characters in the area know that something is amiss—different bits of ground in the area begin to vibrate and twitch violently. On the field’s turn, a random square within the skystone field is the origin of a close burst attack. The same square cannot attack more than once in an encounter.AttackStandard Action      Close burst 1
Countermeasures     Nature DC 27: With a Nature check as a minor action, a character can determine the square on which the hazard will center its attack during its next turn.
     Arcana DC 22 or Thievery DC 22: A character who knows which square of the hazard will attack next can attempt an Arcana check or Thievery check as a standard action. On a successful check, the character stabilizes that square so that the hazard does not attack in that round.

Published in The Plane Below, page(s) 22.