Is your feature request related to a problem? Please describe.
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No

Describe the solution you'd like
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Death Metal Knight is a monthly event taking place at Dark Moon Island only when Dark Moon Faire is active. A toon can partake every month for transmog items and toys. This event is currently not tracked by savedinstances and I think it would be good idea if it's tracked.

Describe alternatives you've considered
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/dump IsQuestFlaggedCompleted(47767) also kinda works

Additional context
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#390