Chromatic zone

Choose one of these elements: fire, earth, ice, lightning, acid. You cover a 30 ft by 30 ft square of area on the the ground, wall, or ceiling. Here are the effects of each:

• Fire. You cover the ground with flame. If a creature starts their turn in the fire, they take 3d6 fire damage. (Material component: a drop of any spirits)
• Earth. You cover the ground with spikes. This creates difficult terrain. For every 10 feet a creature moves through this area, the creature takes 2d4 piercing damage. (Material component: a small pouch of sand.)
• Ice. You cover the ground with a thin layer of ice that cannot be melted. This creates difficult terrain. If a creature tries to move while on the ice, they must succeed a dexterity saving throw, or be knocked prone. (Material component: a drop of water or shard of ice.)
• Lightning. You electrify the ground. If a creature starts their turn in the electrified field, they take 3d6 lightning damage. (Material component: a copper piece)
• Acid. You spray corrosive acid onto the floor. If a creature starts their turn in the acid, their AC is lowered by 1 until their next turn. (Material component: a bit of juice from a citrus)

For every spell slot of above the 4th that you cast this at, you add one damage die to the damaging options or -1 AC for the acid option.