Conjure Whale

You summon a Blue Whale in an unoccupied space you can see within range. The whale behaves according to its nature under the DM's control and remains for 1 hour, after which it disappears.

If the whale appears in the air, it falls. Huge or smaller creatures underneath it must succeed on a DC 15 Dexterity saving throw. On a failed save, a creature takes 20d6 nonmagical bludgeoning damage and is knocked prone underneath the whale's body. On a successful save, a creature can move up to half its speed to get away from under the whale. A creature that chooses not to move or can't move far enough suffers the consequences of a failed saving throw.