The poison of night and day part 2

I don't know how much time has passed, but it's already late. The sun is under the horizon, I closed the window and the curtains. I closed the doors while still having light from a few candles scattered in the room. Lily was able to get some sleep, I think it went slightly mild in the evening. She didn't have any problems with breathing the later it got. But then again, the thing that caused all of this… I know what it is, and of course, it won't be something easy. It is never easy for me. It's a poison, of course, it had to be poison, there is no way that a single person could just touch someone's shoulder and leave it be. It had to be it… And it's not an easy one to concoct. The aftereffects might be fatal. From the description I read, the poison is called 'The venom of night and day'.