Created by the dying wish of Xivrocet, this platinum ring holds a gem of amber, containing the body of a strange loathsome insect. The gem is engraved with a seal bearing an oath of deadly force against a sworn enemy. The ring has 1d6 charges when found, and while worn it recovers 1 charge each day at dawn.
While touching the ring, without other material components and without using your concentration or any of your spell slots, you can use a bonus action and expend one or more of its charges to cast an Oath of Extirpation:
You target a type of creature based on one creature that you can see within range, and swear an oath to eliminate them. These creatures must have the same Monsters listing or stat-block. Until the spell ends, whenever you hit a creature of the targeted type with an attack, unseen forces under your command inflict 1d6 force damage upon the nearest creature of the same type. Also, choose one ability when you cast this spell. When you attack or cast another spell, you can choose one creature of the targeted type to give it disadvantage on saving throws made with the chosen ability until this spell ends or you choose another creature.
A Remove Curse cast on the target ends this spell early.
If the spell ends before any creature you have seen of the targeted type drops to 0 hit points, up to six creatures of that type within 90 feet of you can choose to use their next action to inflict force damage upon you: For each creature that does so, use your own stats to make a Spell Attack roll against your own AC, taking force damage equal to the number of hit dice you have, on each hit.
At Higher Levels. When you cast this spell using more charges, it deals force damage to a number of creatures equal to the number of charges used to cast it, and has a longer duration: 2 charges, 2 creatures, 10 minutes. 3 charges, 3 creatures, 1 hour. 4 charges, 4 creatures, 8 hours. When you use 5 charges or more, its duration is 24 hours. (6 charges, 6 creatures, 24 hours.)
While attuned to the ring, you can cast Oath of Extirpation using one of your spell slots. This spell is cast as a bonus action and does not count against the number of spells you know.
Notes: 1d6 force damage, to (spell Lvl) creatures of the same type, per hit. Duration: 1m, 10m, 1h, 8h, 24h. Take (HitDice)×(up to 6) force damage if spell ends before any seen target drops to 0 hp., Druid, Ranger, Eldritch Knight, Oath of Vengeance, or Order of the Profane Soul, Damage, Debuff, Combat, Jewelry
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