Aeternam was a magus active during the end of the God Wars. Very little is known about her, besides the fact that she was a Guardian of Guthix, the first World Guardian, and 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".