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From Pathfinder Rage of Elements, which isn't enabled.

Weaken Earth

SPELL 1
Traditions arcane, primal
Cast
Range touch
Targets 1 creature, unattended object, or hazard or structure made of stone or earth
Defense Fortitude
Duration 1 minute

You weaken the bonds that hold earth and stone together. If your target has Hardness, you can affect one contiguous object, up to a 5-foot cube, or one creature, decreasing the Hardness by 5, to a minimum of 0. If the target lacks Hardness, it gains weakness 3 to physical damage. A target with a Fortitude modifier can attempt a Fortitude saving throw, negating the effect on a success.

Spell Effect: Weaken Earth


Heightened (+2) Hardness decreases by 5, the size of a contiguous object increases by one 5-foot cube, and the weakness increases by 3.
Pathfinder Rage of ElementsOGL