In Fall of the Trident Reginleif is a valkyrie who is over 1000 years old (though she still looks young). For unknown reasons she has fallen from grace in Odin's eyes and seeks to redeem herself by stopping Gargarensis. She sends the dwarves Eitri and Brokk to reforge Thor's hammer Mjolnir. She also tells the heroes Arkantos, Ajax, Chiron, and Amanra that they have been tricked by Skult in bearing the flag of Folstag and joins them until they return to Atlantis.
Reginleif is a hero unit who hurls javelins and is capable of healing allied units.