Head to the Behemoth Lair in Abandoned Mine lvl2 to face lvl40 Behemoth (132, 135)
Actually, the biscuit doesn't summon him, seems like it reduces the damage you get from him if used. Though you'll have to use it in Abandoned Mine lvl2 before beating him.
Remember, you have 1 hour of logged time to defeat him from the moment you activate the quest, after the time has passed, the quest is declared failed.
Don't worry if you do fail. You get no reward, but you can still continue on with the quest "Ancient Bounty Token".
If you manage to defeat him, go back to Miner Drunky at (296, 57 Silver Mine lvl2).
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