Not being satisfied with Complete Psionic's Corruption and Madness mantle, I decided to cook up my own, along with a few new powers. Enjoy.

Insanity Mantle
Deities: Cyric, Dragon Below, The Fury, Vecna
Granted Power: You may lack sanity, but the power of your madness bolsters your will. You permanently lose 2 points of wisdom, but you add your Charisma modifier, rather than your Wisdom modifier, to Will saving throws.
Aura: All enemies within your aura slowly lose their sanity. Each minute a creature remains in your aura, it must make a Will save, DC 10 + ½ your Divine Mind level + your Wisdom modifier, be confused for 1d4 rounds. A creature that successfully makes its save is immune to your Insanity aura for 24 hours. This is a mind-affecting, compulsion effect.

1. Disable
2. Id Insinuation
2. Swarm of Delirium
3. Cerebral Phantasm (CP)
4. Personality Parasite
4. Schism
5. Psychotic Break (CP)
6. Glorious Madness
7. Psionic Insanity
8. Form of Doom
9. Ego Vortex

Swarm of Delirium
Telepathy (Compulsion) [Mind-Affecting]
Level: Insanity 2
Display: Mental
Manifesting Time: 1 Standard Action
Range: Close (25 ft. + 5 ft./2 levels)
Target: One creature
Duration: 1 minute/level
Saving Throw: Will negates
Power Resistance: Yes
Power Points: 3

If the target fails its save, it believes it is covered in a creeping horde of insects. It takes a -1 penalty on all attack rolls and skill checks. In addition, it must make a DC 15 Concentration check in order to manifest a power or cast a spell.

For every 2 additional power points you spend, the penalty is increased by 1 and the DC of the Concentration check increases by 2.

Glorious Madness
Telepathy (Compulsion) [Mind-Affecting]
Level: Insanity 6
Display: Mental
Manifesting Time: 1 Standard Action
Range: 20 ft.
Area: 20 ft. radius burst, centered on you.
Duration: 10 min./level
Saving Throw: Will negates
Power Resistance: Yes
Power Points: 11

All enemies within the area of this power that fail their save become madly obsessed with you. They become charmed, and take 1d6 points of Charisma damage. In addition, they take a -4 penalty on all saves against mind-affecting powers you manifest.

For every 2 additional power points you spend, the penalty on saves increases by one. For every 4 additional power points you spend to increase the penalty, the Charisma damage also increases by one.

Ego Vortex
Telepathy [Mind-Affecting]
Level: Insanity 9
Display: Mental
Manifesting Time: 1 standard action
Range: Close (25 ft. + 5 ft./2 levels)
Area: 20-ft.-radius spread
Duration: Instantaneous
Save: Will half and Will negates, see text
PR: Yes
Power Points: 15

You reach out with your mind, and destroy the self-consciousness of all creatures within the area of the spell. You erase their ego, their very individuality, dealing 3d6 points of Wis burn and Cha burn to all creatures within range, Will half.

If a creature’s Wisdom or Cha score is lowered to 0 by this, its self-consciousness completely dissipates. It must make a second Will save, this time using the modifier from its lowered Wisdom, or die. If it dies, its body, bereft of any will to animate it, collapses it and dissolves into a organic “soup” of the chemicals it is made up of.

By spending three extra power points, the ability burn is increased by 1d6.

By spending five additional power points, you may destroy not only the will of the creatures–you may also destroy their very soul. Any creature killed by the power can not be resurrected.