Arbiter Spirit

An Arbiter Spirit is a type of invader in Dark Souls II.

General Information
Unlike Dark Spirits, enemies who appear as Arbiter Spirits are always other players, as opposed to NPCs in-game. Arbiter Spirits invade the worlds of sinners in order to hunt down and kill them for their transgression. Killing a friendly character, or invading and killing another player, will make the player susceptible to invasion by Arbiter Spirits.

These invaders are part of the Blue Sentinels covenant, and invade by use of Cracked Blue Eye Orbs.

Arbiter Spirits also appear in the form of friendly phantoms summoned specifically to help a player kill an invading Dark Spirit. These Arbiters will be unable to interact with the environment, and the only entity they can damage or take damage from is the Dark Spirit who invaded.

Rewards for Killing a Sinner
If an Arbiter kills a sinner, they will be rewarded with a Token of Fidelity, which can be used to duel in the Blue Sentinel Arena in Heide's Tower of Flame. Arbiters receive no souls for killing their targets.

Killing an Arbiter
If an Arbiter Spirit is killed, the player will be awarded souls. The sin counter will not go down, nor will it go up.

Being Killed by an Arbiter
If the player is killed by an Arbiter Spirit, their sin counter will go down by one. Normal death penalties will also apply.