Geomancer! 4th and final Magical DPS, who uses the remaining elements of Water, Earth and Air that BLM (and WHM now) doesn’t use so it fills all the gaps in the elements our player can use. Maybe its main mechanic could be using terrain skills (like specific leylines for each element) or totems it puts down to both provide party support and bolster certain Elements in its rotation, giving it a risk reward play with positioning even more than BLM, and more interesting than just turretting.