Hollow King is a custom MVP that can be summoned during the annual Halloween Event by killing a certain number of Gold Porings and Hollow Porings.

It drops several Halloween Tickets Halloween Ticket which can be exchanged for a Halloween Box at Nikolas.

It also drops the following Halloween charms/signs (unstackable) at a 1.00% drop rate each:

Charm Effects
Sign of Nature +1% Fire, Water, Wind, and Earth resistances.
Sign of Hatred +5% damage to Demi-Human monsters.
Sign of Growth +10 to all Stats.
Sign of Agility FLEE +2%
Sign of Accuracy HIT +2%
Sign of a Hunter +15% damage to Boss monsters.
Sign of Recovery +1% chance gaining 20% of the physical damage dealt as HP.
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