Light rune

A light rune is a rune that members can create by bringing pure essence to the light altar near Port Khazard. It is used most commonly in the spell Great Healing. but can also be used in the spells Divine Sword, Give Cure, and Saradomin Rise.

RuneScape Lore
Little is actually known about this rune, its magical signature is much more complex than those which we commonly know. The light altar is believed to be a more direct connection with Saradomin than any other place or action. Even the Saradomin Staff doesn't yield the power of these runes.