Balagarn's Iron Horn

Magic of Faerûn (Mag)Updated Forgotten Realms (3.0)

Balagarn's Iron Horn is a D&D 3.5 spell (Transmutation) from Mag. On class lists for Bard Variant (Level 1), Divine Bard (Level 1), Prestige Bard (Level 1), and others. Range or area: Close (25 ft. + 5 ft./2 levels); Saving throw: None (see text); Duration: Instantaneous; Casting time: 1 standard action.

School
Transmutation
Casting Time
1 standard action
Components
V, S
Range
Close (25 ft. + 5 ft./2 levels)
Area
25 ft. + 5 ft./2 levels cone
Duration
Instantaneous
Saving Throw
None (see text)
Spell Resistance
Yes

You create a deep, resonant vibration that can shake creatures off their feet as if they were being tripped.
Make a single Strength check as if your Strength were 20.
Creatures in the area make individual opposed Dexterity or Strength checks against your roll.
Those who fail are tripped and fall prone.
Those who succeed are unaffected, but cannot make a trip attack against you in response to this spell.
Unlike a regular trip attack, you may trip any creature touching the ground, regardless of size.
You cannot use the Improved Trip feat to immediately make a melee attack against a creature you have tripped with this spell.