Мафия 85. Lux in tenebris

possible clues for a good answer:
Mona - the song Make love, not war, - lyrics from the song Love is the answer - love is the answer.
Master - according to the wiki, Roman Master and Margarita - the answer to militant atheistic propaganda

Added 1 minute ago
Execute Gekasan RU

Too simple, and the clue is based on the nickname. Ment clearly came up with something more clever. Here's an example:

Alexeagle's location in his profile - WhiteCity

WhiteCity - White party - sensation - "The festival originated on a minor note, based on the principle of 'every cloud has a silver lining'." - good - good answer.