This game originated on Solarium BBS in 1990, though it has been continually run on the SDF Public Access UNIX System from 1991 to the present.
mdg is a lot like a cross between nethack and adventure. It uses VI keys to navigate the map with some additional commands. It is a multi-player game where players can play independently (pvp) or cooperatively to explore the map, slay monsters and collect treasure. There is a magic aspect to it by collecting Power Crystals from dragons. In addition to mana which is used for casting spells, Power Crystals allow a player to modify the map.