From the Super Mario Wiki, the Mario encyclopedia
The Water Vellumental is a dragon with water-based abilities and the second Vellumental boss fought in Paper Mario: The Origami King. It resides in the Water Vellumental Shrine located in Autumn Mountain. After the Water Vellumental is defeated, Olivia obtains its Bibliofold and can then transform into the Water Vellumental and use its abilities while Mario stands on certain Magic Circles. This is first used to flood a nearby lake. It is based on the Azure Dragon.
Before Mario starts organizing the rings every turn, the Water Vellumental creates Water Spouts which will wash away any panels in the same column as them after the rings have been organized. Since the Water Vellumental is flying, Hammer attacks (aside from the Hurlhammer) and the 1,000-Fold Arms cannot damage it, although a Jump attack will ground it for the following turn. The Water Vellumental will eventually charge up a Big Wave attack, which can be avoided by using the Earth Vellumental's power. After using Big Wave, the Water Vellumental will be grounded and can take heavy damage from the 1,000-Fold Arms.
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