Custom World Guard Flags

The WGCustomFlags plugin is extremely useful in limiting spell casting in an arena. You may also use WorldGuard 6.2 and up with native custom flag support.

Some examples:

# Only allow certain categories of spells
/region flag spleef blocked-spell-categories master,engineering
# allow all spells to bypass build checks
/region flag spleef allowed-spells *

Or you can block by wand:

# Only allow a certain kind of wand
/region flag spleef allowed-spells *
/region flag spleef blocked-wands *
/region flag spleef allowed-wands spleef