Ingrid's Upgrade Crystals

Ingrid, who was once a Rimelord of the Red Hand, is a skilled artificer. She developed a system of magic item creation that was fully modular, by imbuing disk-shaped crystals with arcane power. These crystals were almost always used to enhance weaponry.
 * Garnet
 * This blood-red crystal imbues a weapon with more raw power. For each crystal, a weapon gains a +1 bonus to attack and damage rolls, up to a maximum of +3.
 * Three of these were used in the creation of Vargach's greatsword.
 * One of these was used in the creation of Saba's trident.
 * One of these was used in the creation of Saba's bow.
 * Sugilite
 * This dark, purplish red crystal improves a weapon's effectiveness in the case of critical strikes. When you score a critical hit, deal an extra 3d6 necrotic damage. You then gain temporary hit points equal to half the necrotic damage dealt.
 * One of these was used in the creation of Kvuska's saw.
 * Fluorite
 * This pale bluish green crystal improves the effectiveness of healing spells cast on the wielder. Whenever you are healed, you gain 2 extra hit points for every die rolled.
 * Azurite
 * This deep blue crystal allows a weapon to be thrown a great distance. A weapon gains a thrown range of 120/300.
 * One of these was used in the creation of Saba's trident.
 * Citrine
 * This yellow crystal allows a weapon to be returned to the wielder after being thrown. As part of your attack action, you can recall a weapon to your hand, so long as it is no further than 500 feet away.
 * One of these was used in the creation of Saba's trident.
 * Jet
 * This black crystal allowed one to harness the forces of shadow to bolster arcane magic. The wielder's spell save DC increases by 2.
 * One of these was used in the creation of Mundo's mask.
 * Moonstone
 * This white crystal allows one magical sight. The wielder gains blindsight to a range of 20 feet.
 * One of these was used in the creation of Mundo's mask.
 * Natrolite
 * This white crystal allows one to paralyze enemies with fear. The wielder can, as an action, cast both cause fear and hold monster once per day.
 * One of these was used in the creation of Mundo's mask.
 * Amber
 * This golden crystal increases the effectiveness of armor. The item grants its wielder +1 AC.
 * Three of these were used in the creation of Fawkes' cloak.
 * Sunstone
 * This orange and white crystal imbues fire spells with lethargic, lingering heat. Any spell you cast that deals fire damage also causes those affected to suffer a point of exhaustion if they fail their saving throw.
 * One of these was used in the creation of Fawkes' staff.
 * Amazonite
 * This bluish crystal imbues lightning spells with chaotic energy. When a creature fails a save against a spell you cast that deals lightning damage, their attacks on their next turn will target a random creature in range, rather than the intended target, and have disadvantage.
 * One of these was used in the creation of Fawkes' staff.
 * Blue Celestite
 * This icy blue crystal imbues cold spells with freezing immobilization. When a creature fails a save against a spell you cast that deals cold damage, that creature's speed is halved for 1 minute.
 * One of these was used in the creation of Fawkes' staff.