The Onyx Hook can be used anywhere to teleport Ninten and his friends straight to Magicant, which otherwise only can be reached by certain stones engraved with "XX". However, it cannot be used to leave Magicant, which forces Ninten to go through the underground tunnel again to leave Magicant before he or Ana learns Teleport. When Eve is in the party, this item cannot be used.
Prices
EarthBound Beginnings
Buying
Selling
Not for sale
Cannot be sold
In-game description
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As long as you have it, you can warp back to Magicant.