Direct Answer
Bones are used for upgrades and useful purchases, including weapon improvements, bags, map support, and Underlab upgrade options.
Short Explanation
Bones are most valuable when they remove a real bottleneck. Before buying, decide whether the current problem is damage, survival, route clarity, farming speed, or late cleanup, then spend toward that goal.
Quick Tips
- Choose upgrades with a clear purpose.
- Do not farm without a specific purchase target.
- Save completion tools for cleanup unless they solve an immediate issue.
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