Fast Attunement (Item quality, constant): Attuning to this magic item is instantaneous. It does not count against the maximum number of magic items to which you may attune. However, ending this attunement requires a short rest.

Prescient Personality (Item quality, constant): The glyphstone is quas0sentiet, emphatically feeding your sense that your ideas aren't just opinions... you can actually see glimpses of the future!

Replace Fate (Minor power, constant): As a reaction, you may allow an ally to reroll an attack roll, ability check, or saving throw they have made. However, one roll you make in the future (chosen by yourDM) will be at disadvantage, and you cannot Replace Fate again until this roll has taken place.

Portent (Major power, single use): Once, as an action, you may use the glyphstone to cast augury. The casting consumes 25 go worth of gems, which you must have in your possession.

Twist Fate (Major power, single use): Once, without spending an action, you may choose to reroll an attack roll, ability check, or saving throw you have made. You must use the second roll.

Carved into this palm-sized chiselled stone is a glowing purple eldritch rune. The moment you touch the glyphstone, you can sense its great power. You immediately yearn to find more glyphstones, for you sense that there are others and that bringing enough of them together will unlock greater power to aid you in your challenge.

You also telepathically hear a familiar baritone voice tell the following tale.

"I wish I could say that Andronicus' agony ended when he was defeated and his fellow warriors were painfully executed, but I'd be lying. Know that Sysuul and Zaltar's bond grew in accord with their cruelty. They dragged Andronicus' poisoned body into the final chamber of their dungeon - a shrine of unholy darkness that was still under construction.

"They heaped Andronicus upon a black altar in the heart of the shrine. Here, in the shadows of flickering braziers, the pair enacted a profane ritual. The orgy of spilt blood and unspeakable foulness culminated with Sysuul tearing Andronicus' soul from his conscious body in an unimaginably excruciating death.

"Far from finished with the paladin, Sysuul captured and enslaved his soul. Binding him for eternity to her service. She corrupted what was left of his consciousness, turning him into a bloodthirsty creature that existed solely to torment and slay the living. Andronicus, one of Mythras' bravest warriors, became one of the most fearsome creatures inhabiting the Dungeon of Doom - the first of the foul Maereghast"