Eiame's Ice Mist Wave

A rolling, cold mist emanates two feet above the ground from a point you choose with range. Each creature in a 2500-square-foot area (see below) originating from that point must make a Constitution saving throw. On a failed save, a creature takes 6d8 cold damage and falls prone. On a successful save, the creature takes half as much damage and remains standing.

The affected area becomes heavily iced and is treated as difficult terrain.

The area of effect can be configured in any way along a line of sight. Common configurations are: 5' X 500', 10' X 250', 15' X 165', 20' X 125', 25' X 100', 30' X 85', 35' X 70', 40' X 60', 45' X 55', or 50' X 50'. (Note: A spell with a 30' radius like Dawn, affects just over 2800 square feet.)

Using an action, you may do one of the following in the spell's area of effect if it has been active in that location for more than one round:

Mist Wave. Starting within the edge of the area of effect closest to you, a wave made of cold mist washes through the entire area of effect. Any creature within that area must make a Constitution saving throw. On a failed save, a creature takes 6d8 cold damage and is hindered by ice formations. A creature hindered by ice has its speed reduced to 0 and is stuck until another creature within reach of it uses an action to break away the ice (see Rime’s Binding Ice), or the spell's area of effect moves, or the spell ends. On a successful save, the creature takes half as much damage and remains standing and free.

Move the area of effect to another space within range. This will cause the current area to immediately de-ice. The new area, with all its initiating deleterious effects, activates immediately.

Pea Soup Vortex. A heavy fog descends within the area of effect for one round. The entire area becomes heavily obscured. A strong freezing wind picks up, and creatures within must make Constitution saving throws. The wind does not disperse the fog. Creatures who fail take 6d8 cold damage, fall prone on the ice, and are spun around until they have no sense of direction. When they regain movement, roll 1d8 to determine their direction (1: NW; 2: N; 3: NE; 4:W; 5: E; 6: SW; 7: S; 8: SE). On a successful save, creatures take half as much damage and retain their footing and sense of direction.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, increase the cold damage by 1d8 for each slot level above 5th.