Sasha's Separate Psyche (3.5e Spell)

''Sasha the Two-Faced suffered from a mental condition that resulted in her entering fugue states for long stretches at a time, during which her normally cheery personality was replaced with a cruel and bloodthirsty disposition that developed its own knowledge and style of arcane arts independently of her. This spell, created in order to harness the power of Sasha’s alter ego, causes the caster to enchant themselves and create something akin to this split personality.''

When this spell is cast, the caster enters an altered state of mind in which they are able to call upon different magicks than normal. Their alignment automatically shifts to the most opposite extreme possible from the norm (for a neutral caster, choose one extreme instead), and for the duration of the spell they are treated by all alignment-related spells and effects as being of that alignment. Other vital statistics for the character, such as ability scores, remain the same.

Secondly, the spell allows the caster to reorganize their spell list for the duration of the spell. Spontaneous casters may have one selection of alternate spells known to access with this spell, which may be changed whenever the caster regain their spell slots. When this spell is prepared, you also prepare the alternate spell selection that you would access when the spell is cast. When the spell is cast, you may mark off any prepared spells that you like from this alternate selection so that you have the appropriate number of spell slots remaining.

Any spell slots that have already been spent cannot be switched by this spell, and any lasting effects from spells with a duration other than "Instantaneous" created by this alter-ego only last until the end of this spell’s duration regardless of their normal duration.