Mac is a boss pet acquired by completing the

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Mac
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Pet ID: melvorD:Mac
Source:
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Volcanic Cave
Drop Chance: 1 in 200 (0.50%)
Effect: +1% Damage to Monsters in Slayer Areas
Part of 100% Completion: Yes
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Volcanic Cave

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The name is a shorter version of Malcs, the boss of Volcanic Cave (and name of The Developer), implying Mac is Malcs' baby dragon.