Conrad's Prismatic Cloud

You create a 20-foot-radius cloud of multi-colored, shimmering gas centered on a point you choose within range. The cloud spreads around corners. It lasts for the duration or until strong wind disperses the fog, ending the spell. Its area is heavily obscured.

When a creature enters the spell's area for the first time on a turn or starts its turn there, Roll a d8 to determine what effect takes place.

1. Red. The target must make a Dexterity saving throw or take 8d6 fire damage on a failed save, or half as much damage on a successful one.

2. Orange. The target must make a Dexterity saving throw or take 8d6 acid damage on a failed save, or half as much damage on a successful one.

3. Yellow. The target must make a Dexterity saving throw or take 8d6 lightning damage on a failed save, or half as much damage on a successful one.

4. Green. The target must make a Constitution saving throw or take 8d6 poison damage on a failed save, or half as much damage on a successful one.

5. Blue. The target must make a Constitution saving throw or take 8d6 cold damage on a failed save, or half as much damage on a successful one.

6. Indigo. The target must make a Constitution saving throw. On a failed save, the target is restrained. It must then make a Constitution saving throw at the end of each of its turns. If it successfully saves three times, the spell ends. If it fails its save three times, it permanently turns to stone and is subjected to the petrified condition. The successes and failures don't need to be consecutive; keep track of both until the target collects three of a kind.

7. Violet. The target must make a Wisdom saving throw. On a failed save, the target is incapacitated. It must then make a Wisdom saving throw at the start of your next turn. A successful save ends its incapacitation. If it fails that save, the creature transforms into a random beast of the DM's choice with a CR of 1/4 or lower as if effected by the spell polymorph and is no longer incapacitated.

8. Pink. The target must make a Strength saving throw. A Huge or larger creature automatically succeeds on this save. On a failed save, the target becomes trapped in a magical bubble and raises up to 20 feet in the air. While inside the bubble, the target cannot target creatures outside of it with attacks or spells, and the target cannot be targeted by creatures outside of the bubble with attacks or spells as they bounce off its surface. The creature can use their action to either move the bubble horizontally a number of feet equal to half their movement speed or to break free by repeating the Strength saving throw. If they succeed, the bubble pops and they fall to the ground. The bubble pops on its own when the spell ends.

The cloud moves 10 feet away from you at the start of each of your turns, rolling along the surface of the ground. The cloud, being heavier than air, sink to the lowest level of the land, even pouring down openings.