Strength of Undeath

Target an undead creature you can see under your control. Target creature gets +3 to attack and damage rolls. If the creature is not undead or is not under the control of the caster, target creature must make a Strength saving throw; failure results in the creature suffering -3 to attack and damage rolls until the end of the spell. At the end of the creatures turn, the creature may make a Strength saving throw to end the effect of the spell.

At Higher Levels: If cast at 3rd level and every 2 levels thereafter (5th, 7th), target creature suffers -1 per spell slot to their saving throw to resist the spell. If cast using a 9th level spell slot, the target creature also suffers the additional -1 to the saving throw, as well as all saving throws being made at disadvantage.