Recently, my curiosity led me to a tower north of Coffinwell that I can only get to by golden flying train. It seemed to match my map labelled 'Tower of Nod'. The first thing I noticed was that my holy water was ineffective. The second thing I noticed was that there were some red treasure chests there.

Probably the most important things I found were the splatterhorns on the second-to-top floor. They are somehow of a higher tier than normal splatterhorns, have more stamina, hit harder and give more experience when felled. I often got 3000-4000 experience points after some battles with them. (I have noticed three different levels of slimes too.)

At the top of the tower there is a vine leading to what looks like a nest. There is a big something sleeping in it. I don't know what it is, but it is in a deep sleep and I think it best to leave it there for now.