You can focus spells to break through doors and shatter walls.
Prerequisite: Knowledge (engineering) 1 rank.
Benefit: A siege spell ignores half an object’s hardness and deals double damage to inanimate objects. This has no impact on the spell’s effect on living or animate creatures. A siege spell uses up a spell slot one level higher than the spell’s actual level.
The Genius Guide To: Feats of Metamagic