The caster destroys the functionality of wooden objects, rendering them useless or causing them to attack their owners. When you cast the spell, you choose one of the following effects: 

Minor Warp: The caster causes a wooden object 5 ft or smaller to bend and warp, destroying its functionality. Shutters spring open, arrows and spears become bent and useless, affected melee weapons impart a -4 penalty to attack rolls, chest lids pop open, etc.

Major Warp: The caster causes a wooden object 10 ft or smaller to bend and warp, destroying its functionality. Doors become jammed in their frames, small boats spring leaks, wagon wheels warp, etc. 

Spike Growth: The caster causes a number of small wooden objects equal to their level to suddenly sprout long, sharp thorns that inflict 1d6 piercing damage to any creature carrying, wearing, or otherwise touching the affected objects. Carried objects are automatically dropped. The affected objects cannot be larger than a spear or shield. Magical wooden objects are unaffected.

Wooden Serpent: The caster changes one wooden item (of spear size or smaller) into a serpent that attacks other creatures as commanded by the caster. Magical wooden objects are unaffected. The serpent has the same stats as a Constrictor Snake.