DescentBB

Is anyone familiar with/played any of these 'series' of levels? None of them are on the more common sites (DMDB and karx's page) but I have all of them in my folder, can't even remember where I got them all from for sure, maybe Valhalla. And from what I know their authors never made too much as far as campaigns are concerned either (with one slight exception that I highlight in parenthesis). All of them are primarily D2 level series.

Galaxy Asteroids/Moons Series (can't recall the author, there six Asteroid levels and twelve Moon levels; the Moon levels have D1 variants as well)
Abalyon series (by Stryker, 7 missions in this series I think)
-MOON XX- series (14 levels, the same author made Harqygia Mission which is on karx's page, I know the author's name begins with [LL])

I recall playing Galaxy Moons many many years ago (possibly 1997 - was soon after I got Kali or possibly even before). I don't remember the actual levels well at all or how good they really were - probably slightly lesser than Chasm but am not really sure.

Found only few o' those to be beatable.

I played several of the moon levels ages ago... they were fairly good but IIRC the texturing was somewhat careless -- I'd put them sub-Parallax but only slightly .
I wouldn't mind playing them again, probably.