Essence Refiner is used to create the elements of essence (Arcane, Earth, Air, Fire, Water, Nature, Ice, Lightning, Life, & Ender). These essences are used in many different spell recipes.
The refiner works similar to a furnace. Arcane ash is the fuel source, and always goes in the middle.
(also requires raw etherium) The rest of the ingredients of the recipe then go in the outer slots. Once a recipe configuration is matched, the outer ring will begin to spin. At this point, the GUI can be closed if desired, as the inventory will be kept in the Block.
Progress is measured by the color of the outer ring. It will slowly fade to purple as progress increases. When it matches the color of the circle of the single slot outside the ring, the refinement will be complete, and the recipe items will be consumed, and the resulting essence will move into the output slot.
Both recipe items and the output slot can stack to 64 items.