Map of -3.5 Nork:

Thanks to Seville's Page

Find the 4 items on this level to get your RatBurrow Sash. The Spider Queen Lair is in the northeast corner. The Dark Guard Lair is in the southwest corner. Sanquin eggs can be found close by the Dark Guard Lair. The Minotaur roams around the level in the northeast.

Source: Original mirror