Ascendant. A class I at first felt was underwhelming when compared to Riftwalker when I first came back to DF. Initially I couldn't understand how to get Ascendant to work properly, get that power I know it was capable of.
But now, after a quick thought and test on my newest character, I can say, wow. It feels amazing to have figured this class' optimal combo, how to best take advantage of the power it's capable of holding.
Sure, compared to Riftwalker, it's much longer to set up. Six turns compared to four for a Riftwalker to best take advantage of their power. But it holds much more of a punch, and it keeps that punch that Riftwalker loses until it can use its final.
Absolutely stunning class, with elegance in everything it does. My only wish is the same wishes Riftwalker held; color-customization and eyes that kept the desired colors. But even without those, Ascendant is a class I easily see myself playing a lot of now, especially on Hard Mode.