magic immunity

[Joseph Rogelio Fernandez <jfernand@ecn.purdue.edu>]

fireballs and lightning bolts come from magic.  magic immunity makes one
immune to the workings of magic. therefore magic immunity makes you immune
to fireballs and lightning bolts.  note: creatures are not smart enough to
drop the resistance for good magic.  immaterial should act as just a
different plane and since magic that made the creature immaterial must
work in both planes magic should work against the creature in immaterial
state as well as creatures in that state using magic against
others.  Physical contact is out so the hirudo can grapple you and be
immaterial but thats why they have so many damn attack spells that don't
require grappling.