The Witcher 2: Assassins of Kings[]
Arbitrator can be found on a submerged skeleton a short distance northwest of Sabrina Glevissig's shrine, northeast of the Kaedweni camp.
The Witcher 3: Wild Hunt[]
Arbitrator returns in the third game in 2 different forms:
Arbitrator (crafted)[]
Crafting Requirements
Min. Required Level: Journeyman blacksmith
Arbitrator (relic)[]
Can be found as random loot, spawning fairly often at the leshen guarded treasure in Oxenfurt forest, northeast from Aeramas' Abandoned Manor.