Aeternam was a Guardian of Guthix and the first World Guardian, known to have been active during the end of the God Wars. Very little is known about her history, besides the fact that she was responsible for casting an enormous freezing spell on the Temple of Lost Ancients, imprisoning the combatants within for thousands of years, and effectively ending the war. She was soon after fused together with four druids into the Balance Elemental by Guthix to protect the Stone of Jas before Guthix returned back to slumber.
- In Latin, aeternam is the female accusative singular of the adjective aeternus, meaning eternal.
- Guthix refers to her as "the eternal one" and "she who lives outside of time".