Anok's Jewelescent Vulnerabilities

Holding the uncut gemstones out in front of yourself, choose one creature you can see within range by focusing on them through the monocle and force the target to make a saving throw, afflicting them with vulnerability to a specific damage-type on a failure. The target makes this saving throw with advantage if they are resistant to the damage-type specified at the time of casting, and automatically succeeds if they are immune. If the target is resistant to the specified damage-type by way of a worn item or equipment - e.g. Armor of Resistance, Boots if the Winterlands - if they fail the saving throw, this spell will neutralize the resistance effect, forcing the target to take normal damage from the specified damage-type for this spell's duration.

If a target that has failed the saving throw would gain resistance or immunity to the specified damage-type (which the target did not possess at the time of casting) while still under the effects of this spell - such as by way of an ability, the effect of the spell Protection from Energy, or consuming a Potion of Resistance - before the resistance/immunity takes effect, the target can reroll the saving throw as they did when this spell was cast. On a success, this spell's hold over the target is instantly broken, allowing the resistance/immunity effect to take its place; on a failure, this spell remains in effect and the resistance/immunity effect is waisted as it fails to take hold.

The damage-type vulnerability and required saving throw of this spell are both determined by the type of gemstone consumed by the casting:

Ruby - Fire - Constitution Save

Aquamarine - Cold - Constitution Save

Tanzanite - Lightning - Intelligence Save

Emerald - Poison - Constitution Save

Citrine - Acid - Constitution Save

Amethyst - Psychic - Intelligence Save

Alexandrite - Radiant - Wisdom Save

Ammolite - Necrotic - Wisdom Save

Moonstone - Force - Wisdom Save

At Higher Levels. When you cast this spell using a spell slot of 5th Level or higher, for every level above the 4th, you can choose to either increase the duration by one minute per level (up to a maximum of 3 minutes) or the total number of targets effected by the spell (up to a maximum of 3 targets). Eg. If you cast this spell at 8th level, you can target three (3) creatures for up to three (3) minutes; if cast at 6th level, you could target one (1) creature for three (3) minutes, three (3) creatures for one (1) minute, or two (2) creatures for two (2) minutes; etc. (When targeting multiple creatures, all targeted creatures must be within a 15ft radius of each other and are all subject to the same damage-type vulnerability.)

When cast at 9th level, this spell can be concentrated on for up to five (5) minutes. Additionally, for the duration of the spell, when a creature dies while affected by this spell, the caster can choose to pass the effect to another creature with 15 feet of the original target; if the caster does this, the new target rolls the saving throw with one (1) degree of disadvantage.