When you take a Magic action to read this scroll, a Kraken appears in an unoccupied space in water that you can see within 1 mile of yourself. A kraken requires a body of water large enough to contain it, or the summoning fails and the scroll is wasted
The Kraken is Hostile [Attitude] toward all other creatures and disappears when it drops to 0 Hit Points. If the Kraken is summoned into a space that isn't large enough to contain it, the summoning fails, and the scroll is wasted.