Nybor's wrathful castigation

Nybor's wrathful castigation was an enchantment spell that inflicted truly agonizing, lethal pain upon a target person or creature.

Effects
For the spell's duration, which lasted anywhere from two seconds to over two minutes, the affected victim was incapacitated by excruciating pain and uncontrollable convulsions. At any moment while they were affected by wrathful castigation the subjected creature could immediately drop dead.

History
The spell was developed by the sadistic Red Wizard Nybor, who served as the zulkir of enchantment during the 13 century DR. It could be found within the spellbook, Nybor's Small Codex.