Maybe someone knows, I'm writing documentation for Heroes 5. In it, I describe the locations of the game files and their various settings. If there are any volunteers who can help supplement the document, please contact me, preferably in a private message.
Currently, I am gathering information bit by bit about the

 and 

blocks.
Questions:
1. Describe how the

texture works. How does it work? As far as I understand, it's a gloss texture.
2. I don't know what

means.
In general, if there are people interested in sharing their knowledge, please contact me.

If I understand the principle of how the gloss texture works correctly, then it is used as additional lighting (separate from the AI geometry), but this lighting does not work on some dungeon arenas and on those where the (AmbientLight) GlossColor = 0 in the settings, I don't know why (apparently, someone with unskilled hands configured it). As for SpecFactor, I only know that it affects the gloss lighting in general; if the value is 30, it is weaker, and vice versa, at -30. I also noticed that if a bump (Normalmap) texture is connected, then the Gloss "overrides" it, but there is no difference whether there is a bump or not. Maybe it's worth experimenting in this direction?