Always leave at least one gargoyle up when you leave that island; there is a delicate ecosystem where dead gargoyles can be replaced by greater skeletons. This means persistent hunting of gargoyles will result in the island being populated by greater skeletons. If you ensure at least one gargoyle remains on the island it will keep killing any greater skeletons that spawn, resulting in an island populated with plenty of gargoyles. Hurrah!
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