Xanos' Phantom is his own soul. Due to the strange way that the Magic Jar experiment he was performing when he was captured interacted with the anti-magic bracers the witch hunters put on him, his spirit is partially detached from his body.
He is learning how to take advantage of his unique metaphysical makeup by pushing his soul out of his body to manifest as an incorporeal or ectoplasmic non-corporeal being.
When he manifests his spirit his logical mind stays in his corporeal body, and his emotional mind controls his spiritual form.
This sometimes causes dissent between the two halves of his personality, but generally the logical side wins out.
Str: 14, Dex: 12, Con 13, Int 7, Wis 10, Chr 13
DR 5/Slashing (when ectoplasmic)
AC (incorporeal): 14 (+1 dex, +2 deflection, +1 cha)
AC (ectoplasmic): 13 (+1 dex, +2 natural)
Touch: 12 (incorporeal) or 10 (ectoplasmic)
+3 Fort (+2 base, +1 con)
+1 Ref (+1 dex)
+2 Will (+2 base, +0 wis)
Power Attack, -1 attack, +2/+3 damage
+3 Slam 1d8+2, 20/x2 crit
Phantom: A spiritualist begins play with the aid of a powerful and versatile spirit entity called a phantom. The phantom forms a link with the spiritualist, who forever after either harbors the creature within her consciousness or manifests it as ectoplasm or incorporeal essence. A phantom has the same alignment as the spiritualist, and it can speak all the languages its master can. A spiritualist can harbor its phantom in her consciousness (see the shared consciousness class feature), manifest it partially (see the 4 bonded manifestation class feature), or fully manifest it as either an ectoplasmic or incorporeal creature. Fully manifested phantoms are treated as summoned creatures from the Ethereal Plane, except that they are not sent back to the Ethereal Plane until reduced to a number of negative hit points equal to or greater than their Constitution scores.
A spiritualist can fully manifest her phantom with a ritual that takes 1 minute to perform. When manifested in this way, the phantom’s hit points are unchanged from the last time it manifested. The only exception to this is if the phantom was slain and returned to the Ethereal Plane, in which case it returns with half its maximum hit points. The phantom does not heal naturally, and can only be healed magically or tended to with the Heal skill while fully manifested. The phantom stays manifested until dismissed by the spiritualist (a standard action) or it is returned to the Ethereal Plane. If the phantom is returned to the Ethereal Plane, it cannot return to the spiritualist’s consciousness or manifest again for 24 hours.
While fully manifested, a phantom cannot be returned to the Ethereal Plane by means of dispel magic, but spells such as dismissal and banishment work normally. If the spiritualist is unconscious or asleep, the phantom immediately returns to the spiritualist’s consciousness. If the spiritualist is killed, the phantom is returned to the Ethereal Plane, and cannot return to the spiritualist’s consciousness until 24 hours after the spiritualist is brought back to life. A phantom cannot be dismissed or banished (by spell or any other similar effect) while it resides in the spiritualist’s consciousness, as the phantom is protected from such effects by the power of the spiritualist’s psyche.
When a phantom fully manifests, its Hit Dice, saving throws, skills, feats, and abilities are tied to the spiritualist’s class level and increase as the spiritualist gains levels.
Incorporeal: When the spiritualist chooses to manifest the phantom with an incorporeal form, the phantom appears with 30 feet of the spiritualist as a ghostly apparition. It gains the incorporeal subtype (Pathfinder Role Playing Game Bestiary 301), including gaining a def lection bonus to AC equal to its Charisma modifier. Since it is not an undead creature, it does not take damage from holy water or positive energy. Unlike other incorporeal creatures, a phantom cannot attack other creatures, even ethereal creatures, except to deliver touch attack spells using the deliver touch spell ability. An incorporeal phantom can, however, pick up and propel objects as the mage hand spell, except it can also pick up and propel magic items. At 5th level the incorporeal phantom can pick up and propel objects up to 10 lbs., and the amount of weight it can propel or pick up increases by 5 lbs. every 5 levels thereafter (to a maximum of 25 lbs. at 20th level).
Ectoplasmic: When fully manifested the Phantom gains the following abilities:
Damage Reduction: A phantom manifested in ectoplasmic form has DR 5/slashing.
Phase Lurch (Su): A phantom in ectoplasmic form has the ability to pass through walls or material obstacles. In order to use this ability, it must begin and end its turn outside whatever wall or obstacle it’s moving through. An ectoplasmic phantom cannot move through corporeal creatures with this ability, and its movement speed is halved while moving through a wall or obstacle. Any surface it moves through is coated with thin, silvery mucus that lingers for 1 minute.
Link (Su): A spiritualist and her phantom share a mental link that allows for communication across distances (as long as they are on the same plane). This communication is a free action that can be performed even when it is not your turn,
but the spiritualist and the phantom must both be conscious to do so. This allows the spiritualist to give orders to her phantom at any time. In addition, magic items interfere
with a spiritualist’s connection to her phantom. As a result, the spiritualist and her phantom share magic item slots. 4 For example, if the spiritualist is wearing a magic ring, her phantom can wear only one magic ring. In the case of conflict, the items worn by the spiritualist remain active, and those worn by the phantom become dormant. The phantom must possess the appropriate appendages to utilize a magic item.
Share Spells (Su): The spiritualist can cast a spell with a target of “you” on her phantom (as spells with a range of touch) instead of on herself. A spiritualist can cast spiritualist spells on her phantom even if the spells normally do not affect creatures of the phantom’s type (outsider). This ability does not allow the phantom to share abilities that are not spells, even if they function like spells.
Darkvision (Ex): The phantom has darkvision out to a range of 60 feet.