Elemental Infusion

The caster permeates the ground directly in front of them with elemental energy; the effect and damage type of Elemental Infusion will vary depending on the chosen element: 

Smoldering Coals (Fire damage): the player ignites a 15-feet long and 15-feet wide area causing the ground to broil with intense heat comparable to burning coals for 6 rounds; the area is treated as difficult terrain to enemies not resistant to fire damage and deals 2d6 of unavoidable fire damage to enemies per round spent inside. As a bonus action, the player may optionally stoke the coals and cause a fire to roar upwards. This surge of heat will deal an additional 1d6 fire damage and reach 5-feet higher per round of duration sacrificed; however, the area will then lose its heat and return to normal.

Excited Sparks (Lightning damage): the player energizes a 25-feet long and 25-feet wide area causing the ground to surge with electrical energy for 6 rounds; the area is treated as difficult terrain to enemies not resistant to lightning damage and deals 1d4 of unavoidable lightning damage to enemies per round spent inside. As a bonus action, the player may optionally concentrate the energy into a bolt of electricity to be used against a single target. This bolt will deal an additional 1d6 lightning damage and reach 5-feet further from the area per round of duration sacrificed; however, the area will then lose its energy and return to normal.

Permafrost (Cold damage): the player chills a single 5-foot square directly in front of them shaping an icy pillar that provides cover based on the player's size in correlation to the pillar; the pillar also emits a chilling aura that reaches up to 10-feet away from the pillar. The aura is treated as difficult terrain to enemies not resistant to cold damage and deals 3d6 of unavoidable cold damage to enemies per round spent within the radius. As a bonus action, the player may move the shard 15 feet from its current location into an unoccupied square.

At Higher Levels. When you cast this spell using certain higher-level spell slots, you choose one of the options above, and the duration is extended: +1 extended duration with a 5th-level slot, +2 extended duration with a 7th-level slot, and +3 extended duration with a 9th-level slot,