A soaper is a dwarf who creates soap from tallow and lye at the Alchemist's laboratory. This is one of the least useful roles in the fortress because any dwarf can be assigned the task and yield the same result since soap has no quality modifier; the only difference is faster production. Additionally, in fortresses without sand (which is required to produce the 3 clear glass vials needed for the laboratory), the soap making profession is entirely worthless. Thus, soapers are typically excellent candidates to be drafted into the military or full-time hauling duty, or otherwise re-trained in another profession.
At present, soap has no different effect than any other bar, but given that the base value of soap is 25☼ multiplied by the [MODVALUE:] of the creature whose fat it is made from, soap can be very valuable to build with. It is also the best way to get value out of megabeast fat (plus, admit it, a bar of Hydra or Dragon soap is just cool - and very valuable).
- "Those who wash earth from their face, I shall wash from my face." Sumu, Goddess of Earth, Tome of the Elders, Book III