|"More monsters! Make more monsters!"
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|“Oh, the Harpies. Hilda, Ingrid and Ulrika.”|
|— Monstrox in "Rotten Luck"|
|Base of operations||Rolling Headquarters|
|First appearance||Rotten Luck|
70353 The Heligoyle
The Harpies are three female winged creatures similar to Gargoyles, Ingrid, Hilda and Ulrika, who form an inseparable trio of flying monsters with great intelligence and viciousness.