Myrtle, the rival to Jessica Lange's fearsome Fiona, is formidable for her ability to magically detect lies and compel others to tell the truth. She's frequently spoken against Fiona, particularly because she (accurately) suspects Fiona of killing the previous Supreme. As you might guess, this doesn't sit well with Fiona, so she frames Myrtle for an acid attack on Fiona's daughter (and Myrtle's protegee) Cordelia and has her burned at the stake. If that weren't enough, Myrtle is revived later in the season, then burned at the stake again for murdering her fellow members of the Council.