Once a month, under the supervision of Jorb, Loftar or a volunteer mod it could be a contest or championship of pvp on the Valhalla halls.
This way grinding and rising a char would make more sense than simple raids or defense and also this could mean more end game contenr.
The winner could receive a ornamented weapon like a sword with runes and slighly better stats, a winged helmet from the valkyries or maybe a cool heavy leather armor. In order to not unbalance the game with this stuff, those weapons will allways be owned by the champion and if he looses next month or if he doesnt fight in the next tournament, the new champ will have it andhe will loose it.
The winner could also win a medal or something that gives better stats, like a ear necklace that can be fullfiled with new ears as long as he wins more championships or get betwen the 3 first places. Or maybe a cup or something to make house pretier inside, like a golden plate with its name written on it.
Valhalla could be accesed through charter stones.