N-Tropy or n-tropy is the username of a level designer and modder. He is also the designer of the NT-BRUSH editor.
In addition to the levels and entities he designed, N-Tropy also wrote one of the early zooming scripts known as "zscope.scr"..
It appears that he began designing various resources for Quake in July, then focused all his energy into a clan called the Klan of Khaos. His second map appears to never have been completed outside of a very basic test state, while one of the entities it mentioned, "monster_att_dog", was never released.
N-Tropy was involved with one of the early Total Conversions known as the Klan of Khaos TC. Various models and entities appear to have been made, shown through a series of teaser screenshots, but it is unknown if this Total Conversion was ever released.