Feeblemind

Feeblemind was a powerful enchantment spell that reduced a person's intelligence and personality to almost nothing.

Effects
Arcane spellcasters were quite vulnerable to the effects of this spell, which were hard to remove.

History
The Netherese arcanist Hamring was given the credit for the creation of this spell in -1293 DR, which was then known as Hamring's feeblemind.

Feeblemind was a common spell in the Realms after 1358 DR.