The Oracle of the Sea in Ultima Online is an essential item for the fishing quest to summon the sea creature Charybdis. It is a special artifact that, when used, identifies a random location at sea where Charybdis can be summoned. This location remains valid for one hour, and the Oracle consumes a charge each time it is used. It can be recharged with fish oil made by a cook. To successfully summon Charybdis, a Grandmaster Fisherman needs to use a fishing pole baited with Charybdis bait while having the Oracle in their pack