Horsa is a Power Level 130 Zealot, and he can be found wandering around the northern area of Oxenefordscire.
Horsa is a burly warrior who wields a large greataxe. Interestingly, he also wanders around on foot and does not have a horse. As his ranged attack, he will throw smoke grenades to obscure your vision.
Horsa uses a blend of strong (red) attacks and lighter (orange) attacks. Lighter attacks can be parried, but strong attacks should be dodged at all costs. If you equip the skill Brush with Death you can trigger slowed time periods by successfully dodging an attack, allowing you to get in some uncontested hits.
Hitting Horsa’s weak points could also be of use. And since he has no shield, shooting his weak points will be slightly easier than for some of the other Zealots. His weak points are both of his shoulders and his left thigh. When you successfully shoot a weak point, you’ll dramatically decrease his stamina, and if his whole bar is depleted, you can get in a powerful Stun Attack.
When you’ve defeated Horsa in combat, remember to confirm the kill to complete this Zealot boss fight. You’ll earn a random powerful rune for this fight and a few other supplies.