Direct Answer
Weapon upgrades strengthen specific weapons through upgrade opportunities and weapon copies, so focus first on the weapon you use most.
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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