Bubble Goop

You breathe out a magical bubble that floats quickly toward one creature within range, which must make a Dexterity saving throw. On a failed save, the bubble bursts over it and covers it with goo, dealing 2d8 acid damage and covering it with bubble goop. Creatures covered with bubble goop suffer a -2 penalty to attack rolls and Dexterity checks, and their speed is reduced by 10 feet. The bubble goop remains until an affected creature or an adjacent ally uses an action to scrape it off. On a failed save, the target takes half damage and is not covered with goo.

Enhancement: For each spell slot used higher than 3rd level, you can create one additional bubble. Each bubble can be targeted against a different creature.