Silicate Brain

Silicate brain: [Minor] by Iczer

'The odds that you can outwit me are substantially not in your favour by a factor of 18.976'

The character's brain is silicate, rather than organic. His thought processes are alien and infinitely more complicated than a less complex mind, though it does alter the character's ability to empathise. +4 IQ +2ME -4 MA. +10% to all purely sedantary skills, -10% to any and all 'people' skills.
The character's mind is highly resistant to psionics, giving him a +4 to relevant saving throws. Furthermore his mind cannot be 'read' by anyone with an inferior (lower IQ) intellect. (Telepathy for instance is garbled).
In extreme cold, the character actually becomes smarter. In an environment of 32 degrees F or colder he gains +2 IQ. At 0 degrees he gains a further +2. He is not especially resistant to cold in any other way however.