The Infuser
The Infuser was a transfiguration utility for tools with custom enchantments.

The item functions similarly to vanilla anvils. However, as one can tell, the crafting cost of the Infuser is significantly higher. The item is consumable and will be lost after a single complete infusion.
Upon right-clicking with the Infuser in-hand, an interface will appear which can be seen below.

Infusions work similar to the Vanilla smithing process. The primary tool (the top cyan square) will always be preserved, while the secondary tool (the bottom cyan square) will be lost and melded onto the first tool. Similarly to an anvil, the resultant slot (the green square) will always contain the result item. If you're ever unsure, double-check the resultant slot as it is certainly the item you will receive. Upon clicking on the resultant item, the forge will be made; the Infuser and both the primary and secondary tools will be consumed for the resultant tool.
A complete infusion process can be seen below.
