The Valkyrie monster upgrade card states, "Gain 2 glory per enemy figure destroyed in battle with this monster."
It does not say "per enemy figure destroyed in a battle with this monster."
It does not say "per enemy figure destroyed in battle by this monster."
I believed it to mean "destroyed with this monster", meaning that the Valkyrie has to be on the winning side of the battle to claim the glory.
It was argued that it meant in any battle involving the Valkyrie, all casualties gave the player 2 glory, even if the Valkyrie lost and was sent to Valhalla. In combination with Frigga's Domain, the Valkyrie can become incredibly powerful. Returning from the dead (for 1 rage!), your Valkyrie could lose in another battle, claiming 2 glory per destroyed figure.
How does the Valkyrie monster upgrade for Blood Rage work?