When casting the Mirage Arcane 5e spell, you make the terrain in the square area of at most 1 mile look like some other terrain in terms of sight, hearing, smell, and even touch, but the general shape of the terrain remains unchanged.
Mirage Arcane 5e
Casting time: 10 Minutes
Components: V, S
Duration: 10 days
How does 5e mirage arcane work?
You can make an open plain or a road like a wetland, a hill, a rift, or another difficult or impassable terrain. You can also make a pond like a lush meadow, a cliff like a gentle slope, or make a chaotic ditch like a wide and flat road.
In addition, you can change the appearance of the building or add a building where there is no building. This mirage arcane 5e spell cannot disguise, hide, or add creatures.
The illusion is a combination of hearing, sight, touch, and smell, so it can turn the empty ground into difficult terrain (or vice versa), and even make it an impassable area.
Any small part of the phantom terrain (such as a stone or a branch) will disappear immediately when it is moved outside the spell area.
Creatures with real vision can see through the illusion and gain insight into the true form of the terrain.
However, all other elements of the illusion will still be preserved, so a creature that realizes that it is an illusion can still physically interact with the illusion.
In the above, you can see that 5e Mirage Arcane lasts up to 10 days.