Invisibility protects you to some extent from haveing spells cast at you. So:
1) Does being invisible protect you from the spells of creatures than can see invisible (e.g. lich)
2) Does being invisible prevent allies from casting beneficial spells on you?
3) Does being (improved) invisible prevent you from casting beneficial spells on yourself?
4) Does being stealthed (i.e. thief) prevent spells from being cast on you?
5) Does going invisible protect you after a caster has started casting but before he finishes?
6) Does going invisible protect you after a caster has finished casting but before the spell hits you?
7) Does improved invisiblity protect you from beholder rays?
8) How about mislead?
9) Does sanctury allow you to cast protective mage spells without being dispelled?
10) Does sanctury allow summoning spells without being dispelled?
11) Does sanctuary allow area of effect spells if they don't affect others (e.g. hast as a solo char, or chant.) without being dispelled?
12) Does the fact that I don't know the answers to these questions mean I should not solo
