Devil's ego

Devil's ego was a transmutation spell.

Effects
On casting devil's ego, the caster's force of personality was magically enhanced for an extended period of time. Furthermore, this spell turned the caster into an outsider where spells cast on him or her were concerned. For example, the caster became effectively immune to charm person. However, the increase in strength of personality did not translate in additional magical power in the form of increased frequency to cast spells, although it made existing spells stronger.

Components
The casting of devil's ego required somatic and verbal components.

History
The only known way to obtain devil's ego was through the Diabolic domain, a suit of spells that was not granted by all infernal entities.