NightBelow.zip:

This Core Rules Expansion file contains the following items:

Aboleth Savant
Eel, Giant Moray
Elf, Rockseer
Giant, Formorian, Offspring
Golem, Shaboath
Ixzan, 1HD - 6 HD
Ixzan, Vampiric
Finslayer (sword)
Leomund's Desirable Residence (magic item)
Scroll, Regenerating

All the information contained in these imports can be found in the materials that come with the boxed set Night Below TSR. 

This file was created on July 29, 1999.  If you are importing it more than 3 months after the creation date, you may want to check for a newer version at the same online sight where you downloaded this one.