Carved into this palm-sized chiseled stone is a glowing purple 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.

Demanding Personality (Item quality, constant):  This glyphstone is quasi-sentient, urging you to hone your skills, achieve greatness, and be precise.

Empowered by Greatness (Minor power, constant):  At dawn of each day, or when first encountered, the glyphstone has one charge.  The glyphstone gains an additional charge whenever you deal a critical hit.  You gain a +1 bonus to attack rolls (including spell attacks) for each charge, to a maximum of +2/+3/+3.  This attack bonus does not stack with an attack bonus granted by another magic item.  The glyphstone cannot gain more than three charges at any given time.

Gift of Greatness (Major power, single use):  Once, as a bonus action, you may spend all of the stored charges (up to the maximum of three) and select yourself or an adjacent creature as the target.  The target regains 2d8+2 hit points for each charge.  A target who would be healed above his or her maximum hit point total gains any excess as temporary hit points.

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