This spell brings into being a twinkling blue-white mote of light that hangs beside one shoulder of its caster and moves with him or her. It is not blinding in its brightness and is quite beautiful. It has three functions that the caster can decide between at the beginning of each round of its existence (once set, the choice cannot be changed until the next round).
Reflect any one spell 100% back at its source.
Block any one attack, magical or physical, absorbing all of its effects harmlessly.
Emit a stabbing bolt of force at a single creature within 90 feet at THAC0 10. A hit burns the creature internally for 4d6 points of damage (no saving throw).
A holy star can emit a maximum of two such beams, but the firing of the second one causes the magic to expire immediately.
Notes: Restricted to priests of Mystra, from the Forgotten Realms setting. This spell is found only in a few exceptionally rare tomes.