Help on spell curse of dementia

Current upkeeper: Oya
Casting time    : 6
Spell cost      : 333
Spell type      : offensive (single)
Affecting stats : Wis, Int, Lvl, guild masteries
Affecting skills: Arcane power, Manipulate reality, Tract of darkness
Affecting spells: This spell
This hideous curse will cause the target to become demented and lose some
spellcasting abilities.

Curse of clumsiness < List > Curse of feeblemind