one who sets fire / (by extension) one responsible for something's popularity, etc.

(linguistics) "role language": unique language usage serving as a marker of social identity in fictional speech

executive officer

disease, sickness / fast, quick, rapid

skillful / clever / deft / dexterous

unlucky / misfortune / bad luck / disaster

signature / government office / police station

elixir of life

pharmacotherapy (use of pharmaceuticals to treat disease)

good advice may be uncomfortable to hear