purgatory

to concoct pills of immortality

to condense milk (by evaporation); condensed milk

(chemistry) to refine

to refine; refining (e.g. oil, chemicals etc)

to polish a phrase

condensed milk

to craft one's words

to refine crude oil; to render animal fat

coking; the process of producing coke from coal

a delicacy (food)

to make steel; steelmaking

smelting iron

maker of immortality pill; concocting magic pills

oil refinery

coking furnace

alchemy

steel mill

iron foundry

to spend a long time thinking about sth while unable to reach a decision

alchemist