Black on Black

You and a number of creatures equal to your spellcasting ability modifier (minimum of 1) become silhouettes, losing all detail and becoming black shadows for the duration. The spell does not have an effect on non-humanoids, and all non-humanoids must make a Wisdom (Insight) saving throw or become hostile to the shadow on sight.

While under the effects of this spell, you have advantage on Dexterity (Stealth) and Charisma (Intimidation) checks at night and in darkened rooms, but have disadvantage to Dexterity (Stealth) checks in the daytime or in well-lit areas.

The spell lasts for the duration and cannot be dispelled except for another ten minute ritual made by the caster or the Dispel Magic spell.