Astral Whale (GAP)

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Sometimes there's things that a body just can't explain. Astral whales are one. Near as anyone can figure, they came from the Living Sea (see the chapter called "Locations in Nowhere: Specific Astral Encounters"), just swimming out into astral space one day and never going back.
See, astral whales look just like whales that a Clueless might be familiar with from some ocean on the Prime. They're the same beast, but they're much more intelligent than those on the Prime, evidently, because they can move very quickly through the Astral.
These huge beasts move through the plane like gigantic nomads. They've got no predators to cause them worry save the occasional githyanki hunting parties on astral ships. Efforts to communicate with them always come to naught - they just want to be left alone (and what better place for such an attitude than the Astral?).
Reference the common whale in the MONSTROUS MANUAL™ tome.