The Formless

Either being of pure thought, or corporeal creatures that have ascended beyond the need for physical bodies, these strange beings are creatures of pure mental energy.
==Background==
==Abilities==
Incorporeal: Incorporeal creatures are invisible, inaudible, insubstantial, and scentless to creatures on the Material Plane. See invisibility and true seeing reveal Incorporeal creatures. They cannot be damaged by unenhanced weapons. Weapons that are enhanced but do not have the ghost touch ability only have a 50% chance to damage an incorporeal creature. The formless have a fly speed equal to 10 ft per HD they possess, with perfect maneuverability. 
An Incorporeal creature can see and hear into the Material Plane in a 60-foot radius, though material objects still block sight and sound. (An Incorporeal creature can’t see through a material wall, for instance.) An Incorporeal creature inside an object on the Material Plane cannot see. Things on the Material Plane, however, look gray, indistinct, and ghostly. 
Incorporeal creatures move in any direction (including up or down) at will. They do not need to walk on the ground, and material objects don’t block them.
==Template Statistics==
Str -, Dex -, Con -, Int +6, Wis +6, Cha +6
Manifest: The Formless can attempt to posses a living creature or an object. A creature is able to resist this effect with a Will save, DC 20 + HD + Int modifier. In order to possess a target, the Formless must first be able to move into that target's space.
Energy Drain: Any unarmed attack made by the formless grants the target a negative level. For each negative level bestowed by the Formless, they gain an additional +2 to their mental ability scores and 5 temporary for 1 minute per HD. Any negative levels in excess of the HD possessed by the Formless do not grant any additional stat bonuses (a 10 HD formless can only get +20 to their mental stats). A formless cannot have more temporary hit points than its current maximum HP. Upon reaching level 20, the energy drain ability also grants an additional +1 to all the saves that the Formless makes. After level 35, this ability also increases the maximum caster level of any innate abilities it may use by 1 caster level per negative level bestowed. 
Mind Incarnate: As beings of pure thought, the Formless are able to treat any class levels as equivalent levels of priest (ascetic-telepath). While incorporeal, the Formless is also able to treat its mental abilities in place of any physical stat that it might need (str for int, wis for dex, cha for con).