Eodon Slayer acts as a super slayer for most creatures inside the Valley of Eodon. Even though the indigenous tribespeople have warmed to Britannians to the point of not openly aggressing against them, one could presumably continue aggressions against them if they so chose to for their loot. On the other hand, such properties would be most useful if you so chose to aid Sir Geoffrey or the Myrmidex in the coming conflict...