Orb wraith

Orb wraiths were incorporeal undead formed when half a dozen or more wraiths merge together at a location of powerful negative energy.

Physical Characteristics
Appearing somewhat like an enormous mass of darkness comprised of various humanoid features, an orb wraith was a constantly shifting amalgam of insubstantial limbs, faces and shining red eyes. Numerous bolts of purple-black negative energy would crackle and spark throughout an orb wraiths body, not unlike a thundercloud.

Ablities
Although an orb wraith lacked the physical presence to exert force upon its surroundings the creature was notably swift and able to react quickly to multiple enemies, despite its size.
 * Assimilate Perhaps its foundational ability, was an orb wraith's power to assimilate lesser wraiths. If the orb wraith slew a wraith it would add that creature to its mass, growing larger and stronger in the process. Eventually an orb wraith can gain so large through this means that it will divide into two smaller orb wraiths again.
 * Constitution Drain The orb wraith's touch was a great bane to living creature as the barest touch could drain the health of even the hardiest individual.
 * Create Spawn Much like other wraiths, any living creature that was slain by an orb wraith would rise shortly after as a normal wraith. These newly created wraiths are under the control of the orb wraith until it is destroyed.
 * Enervation Ray Much like the spell of the same name, an orb wraith could emit a thin purple-black ray at any creature within 60 ft (18.2 m).
 * Unnatural Aura Any domesticate or wild animals within 90 ft (27.4 m) can sense an orb wraith and will not willingly approach the creature.

Psychology
As essentially a conglomeration of ordinary wraiths, an orb wraith shared much of their twisted mentality. However an orb wraith seemed to also manifest a much higher intellect than its lesser kin.

History
Orb wraiths rarely appeared outside of the Negative Energy Plane but on the few occasions they did it had been only within concentrated areas of negative energy, hence earning their 'orb' moniker. Noted focal points included:
 * The orb at the center of the Undying Temple in Maerimydra, during the Silence of Lolth in 1372 DR
 * The mythallar chamber within the Crypt of Augathra the Mad, in 1374 DR.

Appearances

 * Anauroch: The Empire of Shade
 * City of the Spider Queen