Living souls are elemental nodes in the Runespan from which players can draw soul runes. They are found on the top floor. They require level 90 Runecrafting and give experience in cycles of 213 experience each, though occasionally will also give 2 experience when a siphon fails.
Players do not receive any rune essence when a node is depleted of its energy, unlike when creatures are depleted. Upon siphoning, players will get a soul rune, worth 3.5 points.