Location: Follow Hollin road to Eregion/Dunland border, then follow road s from ford.
Strategy: He lives in a small village (10 rooms). He isn't a very tough mob and doesn't have many guards. Just nuke/flee, exits fleeable. After his death open door of his stables, go n w. He calls all the dunlending trappers/hunters in the zone so its best to pick the front gate shut first.
For cleric with break it's even easier - don't even needed to kill Wyrdda. Just pick/open corral east from village entrance, e, break gate - and e is Rohirrim!
Orc shamans (or BNs with 95% awareness/nightvision spell, or just cast unstored earthquakes) can cast darkness and just kill mobs one by one, they can't see in the dark so they wont assist each other.
Level: Same as for Wuda.
Loads: Steel-shafted spear, wooden wall, Horse of Rohirrim.
Mobs unique to the zone: