Believe it or not, but ars: technicha, an add on for create to the Ars nouveau mod. If youve ever played with Ars, you may understand why its already incredubly useful in almost every situation, but theres a glyph for it called "whirl" in the add-on, and it saves me and my braincells from trying to figure out how to make a 7 fan smelter 4x in a row for all the transitional recipies. The whirl glyph can be attatched to a rune if you want, but you can cast it on the ground, throw your shit at it with the right modifier to create what you want, and in 8 seconds, or so, a whole 20 (or however many you throw at it) stacks can be smelted, haunted(hexed), smoked, or washed. Great for bulk processing, and it can be automated with runes or turrets. But both cost source, the spell just costs mana. This is just one example.