Sounding a horn requires a DC 10 Perform (wind instruments) check and can convey concepts such as "Attack!", "Help!", "Advance!", "Retreat!", "Fire!", and "Alarm!" The report of a signal horn can be clearly heard (Perception DC 0) up to a half-mile distant. For each quarter-mile beyond, Perception checks to hear the horn take a –1 penalty.
- Advanced Player's Guide
- Adventurer's Armory
- Ultimate Equipment
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