Permanency

Permanency was a universal spell that made certain spells permanent.

Effect
The caster could make the following spells permanent when cast on him- or herself: arcane sight, comprehend languages, darkvision, detect magic, protection from arrows, read magic, see invisibility, and tongues.

The caster cast the desired spell and then followed it with the permanency spell. This application of permanency could be dispelled only by a more powerful spellcaster.

In addition to personal use, permanency could be used to make the following spells permanent on the caster, another creature, or an object (as appropriate): enhance familiar, enlarge, fortify familiar, magic fang, and resistance.

Finally, the following spells could be cast upon objects or areas only and rendered permanent: alarm, dancing lights, dimensional lock, familiar pocket, ghost sound, gust of wind, invisibility, magic mouth, Mordenkainen's private sanctum, Otiluke's dispelling screen, otiluke's greater dispelling screen, phase door, prismatic sphere, shrink item, solid fog, spiritwall, stinking cloud, symbol, teleportation circle, wall of fire, wall of force, and web.

Variants
The Simbul had found a way to use permanency to place protection from evil on herself, despite the original spell's limitation.