Decaying Ground (5e Spell)
From D&D Wiki
|Casting time:||1 action|
|Duration:||Concentration, up to 10 minutes|
You launch a blast of necrotic energy at a point within range you can see, causing the ground there to become decayed and infused with necrotic energy. All the ground within a 20-foot radius of the point becomes difficult terrain for the duration of the spell. When a creature moves into or within the area it takes 1d4 necrotic damage and 1d4 poison damage for every 5 feet it travels. Any creature that can’t see the area at the time of the casting must make a Perception check against your spell save DC to recognize it as hazardous.