Utter Control. A cube of water, centered no more than 500 feet from you bends to your will. You are able to add water, change the density, or move the water in any way, as well as moving it in any direction.
Engulf. Any creatures of your choice within the cube are engulfed in the water, and must succeed at a DC 16 Strength (Athletics) check to escape. On a success, the creature escapes, and is in a space within 5 feet of an edge of the cube. On a fail, the creature loses an extra round of breath.* Creatures in extra dense water lose breath at a speed multiplied by the same amount you would have to multiply the normal density of water by to get to the current density.
*Drowning:
After 1+(con bonus) minutes (minimum 30 seconds [or 5 rounds]) of holding your breath underwater you fall unconscious, your hit points fall to 0, and you can then survive for a number of rounds equal to your Constitution modifier (minimum 1 round). After that, you begin making your death saving throws as per the standard rules. However, if you become stable there is a problem. If you are still under water you can’t remain stable. So you must start making death saving throws again. This continues until you die unless you are saved in some way.
* - (a drop of water and a pinch of dust)
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