Create Swamp

Point your finger to a spot within range and create a 20-foot-cube area of swampy terrain. When the creature enters the area for the first time on a turn or starts its turn there it must succeed on a Dexterity saving throw or become Debilitated(Lesser) and Corroded by grasping mud and roots as the mire bubbles. On a success you are neither Debilitated(lesser) or Corroded.  If you fail the save and are afflicted with Debilitated(Lesser) you suffer the full effects Debilitated. of Any creature Immune to Acid is immune to the spell's effects. If you maintain your concentration on this spell for its whole duration, the swamp becomes permanent and can’t be dispelled. Otherwise, the swamp disappears when the spell ends. 

Corroded: The creature takes 1d8 acid damage at the start of each of its turns. The creature’s AC is reduced by 2, and its armor or natural armor is visibly damaged. The creature's weapon attacks deal half damage, as the corrosive effect weakens its weapons. You must take an Action to remove/Until the creature is cleaned by magical means or a successful Dexterity saving throw is made.

Debilitated(lesser): The creature’s movement speed is halved. The creature has disadvantage on Dexterity saving throws and attack rolls. Until the creature is restored by lesser Restoration, Healing word or similar magic.

Debilitated: The creature’s Dexterity score is reduced to 4. The creature’s movement speed reduced to 0. The creature automatically fails Dexterity saving throws and attack rolls Ending the effect if the creature is restored by dispel magic, Greater Restoration, Heal, Wish, similar magic or finishes a long rest.