Spike Stones

earth | conjuration

Source Pathfinder Advanced Player’s Guide
Traditions primal
Spell List elemental
Cast 3 actions | material,somatic,verbal
Range 60 feet; Area 20-foot burst
Duration 1 hour

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Long, sharp spikes of solid rock thrust up from the ground in the area. The area becomes difficult terrain and hazardous terrain. A creature that moves on the ground through the area takes 3 piercing damage for every square of that area it moves into.
Heightened (+1) Increase the damage by 1.