I would enjoy a duel till death, but in this case, it's better to bring more people to war instead of solve it one vs one. I doubt Jor would accept a duel till death with Erik. The elf still have a good amount of swordfight.
Caligus, Armonia and Eponllyn against Perdan sounds good. I hope to have time enough to restore Nivemus and burn Westmoor.