Grimdark can come in many forms. For most readers, they have a sense of dark and gritty fiction with plenty of swearing as well as violence. A strong sense of moral ambiguity is a must with many protagonists being compromised antiheroes. The Rhenwars Saga by M.L. Spencer starting with Darkmage, is different since it provides a bunch of idealists as its protagonists, but their actions rapidly go down the rabbit hole of making the world a worse place.