Definitely worth emphasizing what everyone else said about the Ixalis. The quest supplies all the crafting materials you need for them (might need a level 5 gatherer to pick up some quest items) the exp is good and scales with level until 50, and at higher ranks they give you tokens that you can use to trade for any DoH/DoL materia grades 1-4. And later down on the road you might be thankful that you can actually buy oak/walnut/yew lumber from them in bulk instead of gatherin/crafting it yourself