Illusory Terrain

Level	4th Level Spell
Casting	1 Action
Duration	Until dispelled
Range	Within sight
Domains	Air, Water

You magically alter the appearance of the terrain within range for the duration.

The illusion can have visual, auditory, and olfactory components.

An affected creature may make a DC 18 Mental Defense Check once per day. On a success, they see through the illusion. They may alert their allies who failed this Check. They allies are still affected by the illusion, but they know that it is an illusion and proceed with caution.

Note: Effects like Truesight see through illusions instantly.

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Upcast: Increase the DC by 2 per spell level.