Explosive Icicle is a Water Myrmidon action. You can use this ability to shoot three blasts of ice, creating Ice surfaces.
Description
Hurl three tridents forged of glistening ice that pierce targets and create ice surfaces on impact.
Properties
- Cost:
-
Action - Damage:
-
3d8 (3~24) 
Cold damage per projectile - Details:
-
Ranged spell attack roll -
Range: 18 m / 60 ft -
AoE: 2 m / 6.5 ft (Radius) - Creates Area: Ice (surface)
Area: Ice (surface)
Ice 
Duration: 2 turns
AoE: 2 m / 6.5 ft (Radius)
Difficult terrain - movement speed is halved and creatures may fall Prone.
Type: Surface
Condition: Prone
Prone- Can't move or take Actions,
Bonus actions, or 
Reactions, and has 
Disadvantage on 
Strength and Dexterity saving throws. - Attacks against a Prone creature have
Advantage if they're made within 3 m / 10 ft of the creature. - A Prone creature must spend half its Movement Speed to stand up.
- A character with the Athlete feat spends only 1.5 m / 5 ft of Movement Speed to stand up.
- A character with the Athlete feat spends only
Condition: Difficult Terrain
Difficult Terrain- Movement Speed halved
How to learn
Used by creatures: Water Myrmidon
Notes
- The three projectiles can be targeted independently.
- A separate attack roll is made for each target hit in the explosion radius by each projectile.
- This ability uses a ranged spell attack roll. The spell casting ability for a myrmidon summoned with
is Intelligence, but it has an Intelligence score of just 8. As a result, this ability will be considerably less accurate when used by a summoned myrmidon than when used by a druid with 
.