A player can have no more than two phantoms in their world at one time. With the release of Scholar of the First Sin, the player may now have up to three phantoms.
Phantoms are a more lasting ally than a shade, but are still temporary nonetheless. If a phantom dies, or the world host dies, the phantom is sent back to their own world in the same condition they were before they were summoned. If a phantom fulfills its duty, they will be sent back to their world in a new condition. If they were hollowed they will turn human and all spell casts and weapon durability will be replenished. Estus Flasks are also fully restored and lost health is refilled.
A phantom will fulfill its duty by either defeating the area boss or "timing out" by allowing a long period of time to pass. The longer a phantom is present, it will start to lose its radiance indicating that they are going to "time out".
The following is a list of all the NPC phantoms:
List may be incomplete
*Only appears in the Lost Crowns Trilogy DLCs
- It is possible for players to disguise themselves as a phantom by using the White Ring.