Board Thread:Game Discussion/@comment-4682625-20130806011111/@comment-88.159.12.211-20130812145342

You need to defeat it 16 times, killing the 15th gives you 49 boss items.

+15 for kills (+1 each kill)

+7 for completing 1st tier

+12 for completing 3rd tier

+15 for completing 5th tier.

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+49