The harpy phoenix unit I created for my Harpies mod, for the game Battle for Wesnoth.
I went all-out designing a cool and flashy unit (by game standards it is a very high-level one). Her sprite is much larger than that of usual units, since she floats, and she exceeds the hexagon borders a bit.
Even if all the animations took a long time to make, it was a lot of fun, I like doing stylized flames.