Arcane Energy Leak (CR 10)

Arcane energy plays havoc with the minds of unprotected spellcasters. This energy is a mind-affecting effect, but an antimagic field blocks the radiation. Spellcasters suffer the effects every round they stay within the 30-ft. radius.

Non-spellcasters are unaffected by the hazard.

Arcane Energy Leak CR 10
XP 9,600
Frequency 1/round
Effect 3d6 nonlethal damage; 1d6 Int, Wis, and Cha damage (DC 20 Fort save negates ability damage but not nonlethal damage); multiple targets (all spellcasters in the room)