Scroll of Tarrasque Summoning

From Icewind Dale: Rime of the Frostmaiden, page 315.

Description
Scroll, legendary.

Using an action to read the scroll cause the Tarrasque to appear in an unoccupied space you can see within 1 mile of you. The tarrasque disappears when it drops to 0 hit points and is hostile toward all creatures other than itself.