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, which was then known as Hamring's feeblemind.

In 1357 DR evil wizard Cassana placed a permanent version of this spell on the cell containing Finder Wyvernspur, rendering him mad and unable to escape.

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