The land of Boletaria is in turmoil as the Old King Allant awakens the Old One, a terrible demon sealed away below the Nexus eons ago. A colourless fog is unleashing the demons and terrorizing mankind, leaving only one lone hero to save Boletaria from its doom.
Demon's Souls is an action role-playing game where players can choose from various starting classes, including hunters, knights, soldiers, priests, and magicians. The objective is to progress through five worlds and defeat the demon bosses at the end of each level. Killing enemies rewards players with souls, the game's currency, which can be used to upgrade equipment or stats at the Nexus.
Combat in Demon's Souls requires managing the protagonist's stamina bar, which decreases with physical movements. Death does not end the game; instead, the hero respawns in soul form, losing health but retaining increased damage against foes. Players can recover lost souls by returning to their death spot.
The game features an online component, allowing players to observe others playing in "alternate universes" and view replayed deaths to warn themselves of danger. Players can also leave messages about hazards or participate in cooperative gameplay using special items.