The Gremloblin, is a mythical creature and the main antagonist in Gravity Falls episode, "Boss Mabel". He is half gremlin and half goblin, who can make people see their worst fears if they look right into his glowing eyes.
According to the Journal, using water against him should only be as a last resort, as water only makes him more angry. When he looks into his reflection, and thus looking into his own eyes, he sees his worst fear: becoming like his father. This causes the Gremloblin to run back to the forest in terror.
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