Spike StonesSpell 4
Source Pathfinder Advanced Player's Guide
Traditions Primal
Cast
Area 20-foot burst
Range 60 feet
Duration 1 hour
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.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
ConcentrateAn action with this trait requires a degree of mental concentration and discipline.
EarthEffects with the earth trait either manipulate or conjure earth. Those that manipulate earth have no effect in an area without earth. Creatures with this trait consist primarily of earth or have a connection to magical earth.
ManipulateYou must physically manipulate an item or make gestures to use an action with this trait. Creatures without a suitable appendage can't perform actions with this trait. Manipulate actions often trigger reactions.