Otto is a pet acquired at a 1 in 7,500 chance for each monster killed in

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Otto
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Pet ID: melvorF:Otto
Source:
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Dark Waters
Drop Chance: 1 in 7,500 (0.01%)
Effect: -0.1s Attack Interval
Part of 100% Completion: Yes
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Dark Waters

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Having Otto with you as a pet reduces the time between attacks by 0.1 seconds.