Thread of Fire

The caster creates a thread of pure magic that trails behind them and starts and ends when they wish it, the thread can stretch a maximum of 20ft and can be segmented to create several hovering threads at least 5ft apart. Once per turn, the caster can use their bonus action and choose to ignite a thread within 5ft of them, segmented threads cut off from the ignited thread will not be ignited with it. Alternatively, these threads can also be triggered after being targeted by any attack that does fire and or radiant damage, but the thread will always deal fire damage regardless of the magic type used to ignite it..

When the caster casts this spell their movement will no longer trigger opportunity attacks by means akin to the disengage action, and they will gain an extra 5ft of movement.

Threads will remain until its ignited, until concentration is dropped or until it is dispelled.

When the thread is ignited everyone in a 5 foot radius must make a Dexterity Saving Throw or take 2d8 fire damage and half as much on a successful save. If the caster ignites the thread they will not take this damage but if the thread is ignited by any others means, everyone, including the caster, within range of the thread will be forced to make the save. 

Even if the threads overlap the damage will only be dealt once to the creatures in its range.

At Higher Levels: When you cast this spell using a spell slot of 3rd level or higher, this spells damage increases by 1d8 for every spell slot above 2nd.