During the code review, it has been noticed that to bidding mechanism is vulnerable to front-running. The bidding mechanism can have EOA check on the contract. 
ForgottenRunesWarriorsMinter.sol#L120
Consider to check EOA at the beginning of the function.
For this contest, 73 reports were submitted by wardens detailing gas optimizations. The report highlighted below by BowTiedWardens received the top score from the judge.
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