Ariel Augustus is one of the two secondary antagonists (along with Miriam Meed) of American Horror Story: Apocalypse. He is Michael's former mentor turned enforcer who believes that he should become the supreme, and alongside Anton LaVey he leads a satanic cult which tries to end the witches for good.
Ariel Augustus was the extremely powerful and rich grand chancellor of Hawthorne's School. As he interviewed Michael along with his assistant Baldwin Pennypacker. Michael was powerful enough (in his opinion) to become the next supreme. However, Cordellia Goode disagreed with his ideas of Michael becoming the next supreme, as it should rather be a woman. Many years later, Michael was put into jail, and Ariel along with Meed came to rescue him. They taught him his true path in life and unleashed his true potential. He used Michael as a tool which he intended to use against the witches. Later, he is called by Bubbles and Myrtle for a dinner meeting, only so Bubbles could discover his ambitious plans; to kill all the witches so they won't stop Michael from destroying the world. He orders Baldwin to create a formula against the witches, but while Baldwin presents Ariel the magic formula, they are both interupted by all the witches who come together and take Ariel, Baldwin and later also Miriam Meed as hostages. Cordellia then shuts their mouths up, and sends her bodyguards to tie them up a rope and torture them. Meed reveals that Michael is on his way, and that he intends to bring the world to it's end; the apocalypse. Ariel is then burnt alive, along with Meed and Baldwin.