This spell was developed by the powerful archwizard Ioulaum of Netheril circa the Year of Dwarves Besieged, –674 DR (3185 NR, during Netheril's Shadowed Age)[note 1] to extend his lifespan over the centuries.
Ioulaum's longevity dealt massive damage to every creature within its area of effect. Any creature slain by this spell was reduced to dust. The spell also damaged constructs, objects, and undead, but only living creatures could contribute to the longevity of the caster. Each living creature destroyed by this spell extended the life of the caster by one year.
This spell required verbal and somatic components to cast, but without live creatures within the radius of effect there would have been no longevity benefit.
- ↑ Page 9 of The Winds of Netheril states that Ioulaum developed his longevity spell just as Karsus was becoming the youngest archwizard ever at the age of 22. Calculating from his birth year gives this date.