Drinol are a strange Covenant race that have a very odd power. They have the innate ability to render themselves completely invisible, as well as non-solid and noiseless. They can use this ability whenever they want to, and used it to great extent during the Human-Covenant War, so much so that the Humans did not even learn of their existence until 300 years later.
Their role in the organization is non-militarial since they cannot pick up weapons.
The Drinol apparently abandoned the Covenant following the fall of High Charity, and they all met up on the nearby planet of Basis. Since they are non-solid they can fly at will though space and survive in vacumn. They all agreed to suspend their involvement in the war until they had figured out how to turn back to being solid again.