When are attacks targetting Will most common? Samples please?

[Ninjerk]

The Wild Orlan racial got me thinking: when do you start seeing significant amount of Will attacks/spells?  I've been starting up PotD+Expert (sometimes with Trial of Iron) playthroughs to test out builds for the early game, and the first major defense that really gets tested is Fortitude (phantom stunlocks).  I'm assuming Will defenses are primarily checked against Charm and Dominate type spells.  What other significant (in terms of frequency and/or magnitude) tests of Will can I expect to encounter further along in the game?

[Mungri]

Just cast any of your friendly fire will save spells on your wild orlan tank(s) and voila.