Dungeon Siege III Quests and co-op: shared campaign and Legion decisions
Follow the story and understand the host-centered cooperative campaign.
Edition covered
Original Dungeon Siege III campaign and publisher PC pictures. Treasures of the Sun adds a separate adventure and changes progression options; its systems are not assumed in these base-game tables.
Quest guidance points to the selected objective

Use the quest guide and journal together. The guide helps locate the active task, while journal text explains what is required and why a conversation or item matters.
| Tool | Purpose | Habit |
|---|---|---|
| Quest journal | Stores active tasks and context | Read the current stage |
| Quest guide | Shows the selected route | Select the intended objective first |
| Dialogue choices | Shape responses and influence | Consider the active companions |
| Save slot | Preserves the campaign state | Save before major transitions |
Decisions develop companion influence
Companions react to dialogue and story choices. Their responses help establish the party’s relationships; do not assume a conversation choice is irrelevant simply because the next fight occurs in the same location.
| Feature | How to think about it | Practical effect |
|---|---|---|
| Host campaign | The shared story state | Return to the same host for continuity |
| Available heroes | The four protagonists | Coordinate character choices |
| Drop-in participation | Join the ongoing adventure | Learn the current hero’s build |
| Shared session progress | Belongs to this campaign | Do not expect a free-export loot character |
Co-op belongs to the host campaign
Joining players control available heroes in the host’s adventure. Plan recurring sessions around that shared save rather than expecting a separately leveled loot character to transfer freely between unrelated hosts.
Finish local work before major departures
Story transitions can change access to locations and contacts. Review optional tasks, buy needed equipment and preserve a manual save before accepting an obvious move into the next major stage.
References
| Reference | Website |
|---|---|
| Dungeon Siege III publisher listing | store.steampowered.com |
| Publisher game manual | shared.akamai.steamstatic.com |
| Obsidian game overview | www.obsidian.net |
| Developer forum co-op explanation | forums.obsidian.net |
