I am going to say that Shape Element is an ability for my take on the A5e Genasi. It's something that comes naturally to them.Shape Element
Casting Time: 1 minute
Range: 30 feet
Area: 50-foot cube of one element (air, earth, fire, or water)
Duration: concentration, up to 1 hour (special)
You take any existing amount of one element (air, earth, fire, or water) and shape it. You can take the fire from a torch and shape it into a wall of fire (which inflicts no more damage than the torch) or create a safe passage through a forest fire. You can take earth from the ground and make it into a bridge or a statue, or create a passageway underground. You can take the air out of a room and shift it elsewhere. You can shape the air to form a continual gusting wind effect in the area (no stronger than a moderate wind). You can, by manipulating either air or water, create a bubble of air under the surface of a lake. You can make a statue out of water, or a wall or a dry passage through a pool. An object you can create can have hinges and latches, but fine mechanical detail isn't possible.
If you maintain concentration for the entire duration, the duration becomes permanent. However, water and air can be fouled or consumed, fire may cease to burn when it runs out of fuel, and an earthen structure may collapse if not structurally sound.
(I'm assuming this is an ability, not a spell)
When you gain this ability, choose one of the following elements: air, earth, fire, water. You can use your action to shape that element in a 5-foot cube, as follows (the element must be nonmagical in nature):
Air: A Medium or smaller creature that is within 10 feet of you must succeed on a Strength saving throw (using either your spell save DC or maneuver save DC) or be pushed 5 feet away from you; you can move an object that weighs less than 5 pounds up to 10 feet away from you; and you can cause a harmless sensory effect, such as rustling leaves or slamming shutters.
Earth: You can move a pile of loose earth, sand, gravel, or mud up to 5 feet away; you can cause shapes, images, patterns and/or colors to appear in the dirt or stone for 1 hour; and you can cause earth- and stone-based difficult terrain to be normal terrain, and vice versa, for 1 hour.
Fire: You can expand the flame 5 feet in one direction, provided there is fuel in the new location; you can extinguish the glames; you can double or halve the area of bright and dim light cast by the flame and/or the flame's color, for 1 hour; and you can cause simple, vague shapes to appear in the flame for 1 hour.
Water. You move or change the flow of water up to 5 feet in any direction; you can cause the water to form simple shapes such as fountains for 1 hour; you can change the waters color and/or opacity for 1 hour; and you can freeze the water, provided there are no creatures in it, for 1 hour, although warm temperatures will cause it to melt sooner.
You can't inflict any damage with this ability. Unless otherwise specified, the changes you make last for 1 round.
Like I mentioned earlier in this thread, I can see a particular Genasi gift dictating which element a Genasi can shape with this ability. So if you decided to play a Fire Genasi by picking up the Gift of Flames (?), you would get the ability to shape any existing flame around you. I also think that the size of the affected element could increase at 5th, 11th and 17th level. When a Genasi reaches 5th level, they could shape their given element that exists in a 10-foot cube. By 11th level, it would be a 15-foot cube and by 17th level, it would be a 20-foot cube.
Thanks for the assist, Faolyn.