Invocation Grade: Lesser
Equivalent Spell Level: 4th
You speak a word of the Dark Speech, causing one flying creature to be forced downward suddenly. You can affect a single target creature within 60 feet. The target must make a Will save or fall 5 feet per caster level. A creature that is forced to the ground as a result of this invocation takes 1d6 points of damage per 10 feet traveled and cannot fly again for 1 round.
Source: Dragon Magic, page 82.