Cantante Violinist

Sadistic Curse. The Cantante Violinist can curse a target within 30 ft. as a Bonus Action for 1 minute. Against the cursed target, the Cantante Violinist has a +4 to damage rolls, scores a critical hit on a 19-20, and gains 15 HP if the target drops to 0 HP. Additionally, they can teleport up to 30 feet towards an unoccupied space within 5 ft. of the cursed target.

Cursed Defense. If a target cursed by the Cantante Violinist attacks them, they can use their reaction and roll a d6. If the result is 4, 5, or 6 the attack misses except for Critical Hits.

Touched by Shadows. The Cantante Violinist can use the spells Inflict Wounds and Invisibility once per day without using a spell slot at their base level.

Eldritch Intensity. The Cantante Violinist adds their Charisma Modifier to all Eldritch Blast attacks. Additionally, when they hit a target with their Pact Weapon or Spelldrinker Blade, they can choose to expend one of their spell slots to deal an extra 1d8 of Force Damage, plus another Xd8, where X is the level of the spell slot. If the target is Huge sized or smaller, they're knocked prone.

Shimmerblood Spellcasting. The cantante violinist is a 10th-level spellcaster. The cantante violinist's spellcasting ability is Charisma (spell save DC 19, +11 to hit with spell attacks). The cantante violinist has the following warlock spells prepared:

Cantrip (at will): eldritch blast**, mind sliver, thunderclap, toll the dead
5th level (2 slots): banishing smite, branding smite, counterspell, curse of fatigue*, dimension door, mind spike, shadescales soul grasp*, staggering smite, vampiric touch, wrathful smite

*Homebrew Spell, currently on DNDBeyond
**Charisma Modifier added to Damage

Multiattack. The Cantante Violinist makes two attacks one-handed with their Spelldrinker Blade, and one with their Pact Blade, or two attacks two-handed with their Spelldrinker Blade.

Spelldrinker Blade. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 9 (1d8 + 5) slashing damage, or 10 (1d10 + 5) slashing damage if used with two hands to make a melee attack.

Pact Blade. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) piercing damage.

Spelldrinker's Counter (3/Day). The Cantante Violinist can use their Spelldrinker Blade to cast Counterspell at 3rd level as a Reaction. If it succeeds, then they gain a spell slot equal to the level of spell that was countered.