Hi, here is an ebuild for the Quake 1 campaign, "Zerstorer - Testament of the Destroyer", which features new weapons, monsters and items. The campaign maps are both single-player and multiplayer-ready, with additional multiplayer-only maps.
This mod is frequently reviewed as one of the best Quake 1 campaigns ever - some reviews are:
The ebuild was created by lazy_bum, and tidied by me.
The download is 12mb (surprisingly small).
Created attachment 94155 [details]
(In reply to comment #0)
> The ebuild was created by lazy_bum, and tidied by me.
That would be me. ;]
Have fun with the mod!