Algal Bloom

4th-level conjuration

Casting Time:1 action

Range:60 ft.

Components:V, S, M (a pinch of dried algae)

Duration:Concentration, up to 10 minutes

You conjure dangerous green algae. Choose one of the following effects:

• Create Slick. You can create one 30-foot square area of cloying green algae. The algae floats on the surface of liquid and blocks line of sight into or out of the water. In addition, swimming creatures touching it must succeed on a Reflex save or be coated with the slippery algae, affecting them as grease (as the spell). A creature coated in algae has disadvantage on Dexterity (Stealth) checks, and its location is clearly visible even if the creature itself is invisible. You can create this algae on land, in which case it affects all surfaces within the target area as grease, but it dries out quickly, reducing the maximum duration to 1 minute.
• Caustic Slime. You can create a 10-foot square of slimy green algae that floats on water. When you create the slime, each creature in the area must succeed at a Dexterity saving throw or contact the slime. Any creature that comes into contact with the slime takes 1d10 acid damage, and again at the beginning of its turn until the slime is destroyed or scraped off. Any effect that deals cold, fire, or radiant damage, or that harms plants, instantly destroys an area of caustic slime. An affected creature can use an action to remove the slime with a successful Dexterity saving throw. It can also be removed by a small amount of any damage source that destroys an area of slime; for instance, a lit torch can be used to burn it off.
• Animated Slime. You conjure animate piles of slimy algae. You summon three creatures that appear in unoccupied spaces within range you can see. Each has the characteristics of an ochre jelly, but is considered a plant. Any creature harmed by the slime is exposed to sewer plague.

The summoned creatures are friendly to you and your companions and understand your verbal commands. Roll initiative for the summoned creatures as a group, which has its own turns. They obey any verbal commands that you issue to them (no action required by you). If you don’t issue any commands to them, they defend themselves from hostile creatures, but otherwise take no actions.

At Higher Levels: When you cast this spell using a spell slot of 2nd level or higher, the area of the slick increases by 10 feet for each slot level above 4th, or the area of caustic slime increases by 5 feet on a side for each slot level above 4th.

If a higher-level slot is used to summon an ochre jelly, the spell will summon two creatures if a slot of at least 6th level is used, and three if a spell slot of at least 8th level is used.