Granted Power: You subtract 1 from all Wisdom-based skill checks and all Will saves. However, once per day, you can see and act with the clarity of true madness: Add one-half your level to a single Wisdom-based skill check or Will save. You must choose to use this benefit before the check or save is rolled.
Madness Domain Spells
1 Confusion, Lesser: One creature acts randomly for 1 round.
2 Touch of Madness†: Dazes one creature for 1 round/level.
3 Rage: Subjects gain +2 to Str and Con, +1 on Will saves, –2 to AC.
4 Confusion: Makes subject behave oddly for 1 round/level.
5 Bolts of Bedevilment†: One ray/round, dazes 1d3 rounds.
6 Phantasmal Killer: Fearsome illusion kills subject or deals 3d6 damage.
7 Insanity: Subject suffers continuous confusion.
8 Maddening Scream†: Subject has –4 AC, no shield, Reflex save on 20 only.
9 Weird: As phantasmal killer, but affects all within 30 ft.
Source: Spell Compendium