Kruphix wears Asteri, a cowl made of Nyx. Kruphix uses this cowl to help govern the cycle of time. He counts few followers among the population so none have been known to receive this power. However, should he grant this item to a mortal it would be to aid all of Theros.
Cowl of Time. This cowl grants a +2 bonus to spell attack rolls and to the saving throw DCs of spells you cast (excluding spells cast from this cowl). Additionally, you have resistance to necrotic and radiant damage.
Blessing of the Timeless. If you are a worshiper of Kruphix, you gain all the following benefits for which you have the required piety:
Piety 10+. The cowl has 1 randomly determined minor beneficial property.
Piety 25+. The cowl has 1 randomly determined major beneficial property.
If you aren’t a worshiper of Kruphix, the cowl has 2 randomly determined major detrimental property.
See “Artifacts” in chapter 7 of the Dungeon Master’s Guide for details on randomly determined properties.
Rewind. You can use your reaction to reroll a saving throw. You must use the new roll.
Spells. The cowl has 15 charges. While holding it, you can use an action to expend 1 or more of its charges to cast one of the following spells (save DC 18) from it: hold person (2 charges), blink (3 charges), haste (3 charges), slow (3 charges), hold monster (5 charges), time stop (9 charges). The cowl regains 1d12+3 expended charges daily at dawn.
Destroying the Cowl. The only way to destroy the cowl is to unravel it with Klothys's spear Nimoiras, unwinding its destiny, in the very prison of the Titans in the Underworld.
Notes: Bonus: Spell Attacks, Resistance: Radiant, Resistance: Necrotic, Bonus: Spell Save DC, Bard, Cleric, Druid, Monk, Ranger, Wizard
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