Rune of the Mainspring

Rune of the Mainspring is a rune in Task Bar Hero's account-wide rune tree. At max level it grants "Unlock Auto-Open Act Boss Chest". It has 1 level and costs 1,000,000 gold to max out.

Cost per level

Runes are bought with gold and apply to every hero on the account. Plan a full path on the Rune Planner, work out which stage repays it fastest with the Farming Planner, or browse all 197 nodes on the Runes page.

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