Magic:Balagarns Iron Horn

Transmutation
Level: Brd 1, Sor/Wiz 2
Innate Level: 2
Component(s): V
Casting Time: 1 Action
Range: Personal
Target: Colossal
Duration: Instantaneous
Counter(s): --
Saving Throw: None
Spell Resistance: Yes
Metamagic: Quicken, Silent, Still
Energy Substitution: No

The caster creates a deep, resonant vibration that shakes all creatures in the area of effect from their feet if they fail a Strength check (as if the caster had a Strength of 20). Every creature that falls will be knocked down for one round.