Caltrops

When this spell is cast, the wizard conjures a field of sharp, metallic caltrops that materialize on the ground within range. Any creature moving into or through the area risks injury. A creature moving into the area or struck in melee while in the area must succeed a saving throw vs. Paralyzation or step on a caltrop, suffering 1 point of damage and halting movement for that round. Creatures with bare feet make this saving throw with a -4 penalty. A creature moving at less than half of its normal speed does not need to make this saving throw unless it is struck in melee.   If a creature has stepped on a caltrop, it move at half speed and takes 1 damage for every 10 feet walked. A creature that steps on a caltrop can use a round to remove the caltrop. If a creature does, it must make a second saving throw. On a failure, it still moves at half speed for the next 24 hours or until it is magically healed.
 

This spell allows the caster to conjure magical caltrops that fill the ground in a 5-foot by 5-foot square you can see within range. These magical caltrops act as normal caltrops would for the duration of the spell. If you cast this spell again while it is already active, the effects of the previous casting ends instantly.   This spell can affect an additional 5-foot by 5-foot square when you reach 5th level (2 squares), 11th level (3 squares), and 17th level (4 squares).
 

You conjure a path of shimmering caltrops upon the ground in a 5-foot square within range. The area becomes hazardous terrain. A creature that moves into the area must attempt a Reflex save. A creature that treats this area as difficult terrain does not need to make this saving throw. If you cast Caltrops again, any previous casting immediately ends.   Critical Success: The creature avoids the caltrops entirely.   Success: The creature steps carefully and moves at half Speed through the area.   Failure: The creature takes 1 piercing damage and takes a –10-foot circumstance penalty to Speed until the end of its next turn.   Critical Failure: The creature takes 2 piercing damage and falls prone, with the same Speed penalty.

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Heightened (+2) You can create one additional 5-foot square of caltrops.