Three-Key Contract
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The Three-Key Contract is a Collectible in Mizuki & Caerula Arbor.
Item description
+3 Keys
According to regulations, lighthouse keepers must always carry three keys: one to unlock the main door, another to establish communication, and one to activate the searchlight. Sign your name, and the contract is set in stone. Carry the keys with you at all times, regardless of life or death.
Effect
Gives 3 
Key when obtained.
Acquisition
The player must have entered 100 nodes other than (Emergency) Operations and Dreadful Foes across all runs before the Three-Key Contract can be obtained from the next run.