Eye of the Beholder (game)

Eye of the Beholder is a computer game released in 1991. It was developed by Westwood Associates and published by Strategic Simulations, Inc. for DOS, Amiga, Sega CD, SNES and PC-9800. It is the first game of the Eye of the Beholder series.

Plot
The lords of the city of Waterdeep hire a team of adventurers to investigate an evil coming from beneath the city. The adventurers enter the city's sewer, but the entrance gets blocked by a collapse caused by Xanathar, the eponymous beholder. The team descends further beneath the city, going through dwarf and drow clans, to Xanathar's lair, where the final confrontation takes place.