Thaumaturgic Sigil

This spell is cast on a willing target other than the caster, lending them some of the caster's power for a time.

Choose one of the following options:

Sigil of Fortitude: Grants the target a +2 bonus to AC and CON saves. While this sigil is active, the caster has -2 AC and disadvantage on CON saves, as they have transferred some of their bodily strength to their ally.

Sigil of Alacrity: Grants the target a bonus to initiative rolls equal to the caster's spellcasting modifier. While this sigil is active, the caster has disadvantage on initiative rolls, as they have entrusted some of their reflexes and swiftness to their ally.

Sigil of Charm: Grants the target a +3 bonus to all Charisma checks. While this sigil is active, the caster loses all proficiencies in charisma based skills, and take a -3 penalty to all charisma checks.

This spell cannot be cast again by the same caster while it is already active. While this spell is active on a target, the caster cannot regain the spell slot used to cast this spell, even with a long rest. As an action, the caster can end the spell, ending both the benefits to the target and the detriments to the caster.