The Blue Bar in Return to Moria represents your equipped weapon or tool's Durability. It is located directly beneath your weapon/tool icon in the bottom-right HUD overlay.
How Durability (Blue Bar) Affects Gameplay
As you use a weapon or tool (e.g., striking enemies, mining ore, chopping wood), its Blue Bar gradually depletes from right to left. When the bar fully empties:

- The Item Breaks: The weapon or tool immediately becomes unusable.
- Inventory Removal: The broken item disappears from your inventory slot.
- Loss of Function: You lose the ability to fight with that weapon or perform actions with that tool until you repair or craft a replacement.
Repairing Weapons and Tools
To restore the Blue Bar (Durability) and prevent items from breaking:
- Repair Forge: You must use a Repair Forge, typically built at bases like the Stone Hearth. This requires unlocking the recipe.
- Resource Cost: Repairing consumes resources. The cost depends on the item repaired. Common costs include Iron Ingots, Coal, etc. The UI clearly shows the required materials before confirming repair.
Strategic Importance & Impact
- Resource Management: Players must actively gather sufficient resources both for crafting and repairs. Durability acts as a constant drain on materials.
- Inventory Preparation: Venturing far from base requires bringing multiple weapons/tools or ample repair materials. Running out deep in Moria can be catastrophic.
- Base Infrastructure: Establishing bases with Repair Forges becomes essential for sustained exploration.
- Masterwork Weapons: Higher-tier Masterwork Weapons significantly reduce durability loss, making them highly valuable for efficiency.
In summary, the Blue Bar is a critical durability mechanic forcing players to manage resources carefully, establish infrastructure, and maintain their gear to survive the depths of Moria.