Aerial Alarm

Heroes of Battle (HB)Supplementals (3.5)
School
Abjuration
Casting Time
1 standard action
Components
V, S, DF, F
Range
Medium (100 ft. + 10 ft./level)
Duration
2 hours/level (D)
Saving Throw
None
Spell Resistance
No

As alarm (see Player’s Handbook page 197), except the area is a cylinder that extends 500 feet into the air and the alarm only sounds when a flying creature of Medium or larger size enters or touches the warded area.
Arcane Focus: A silver bell and an eagle’s feather.