Astral Mark of the Leviathan FFXV (NGtE)

You passed the trial and now bear the Astral Mark of the Hydraean Leviathan.

• You can summon the Hydraean Leviathan to intervene in a time of need. If you drop below 10 hit points and within 2 miles a body of water, as an Action you can roll a d100, on an even number, the Leviathan appears as an ethereal entity and floods an area as large as your DM decides. You can cast the cone of cold spell at 9th level changing the damage type to bludgeoning instead as the spell is altered to a powerful stream of water. Or, you can cast control water, using your Spell Save DC.
• If any Astral entity intervenes, you can’t use another Astral Mark feature again for 7 days. Otherwise, you can attempt to use it again after you finish a long rest.