BaseMod is a plugin for Diablo II that enhances the original game with new code.
BaseMod v1.13.6 adds the option to add 1-4 extra Uber Diablo's in the World Event as a monster pack. Each can spawn minions, if enabled. And each Uber drops an Annihilus charm. There are different settings for SP and MP games to spawn Ubers. All coded from scratch, all original.