Endeavour’s fire threads

Endeavor's Fire Threads is a melee spell with 10ft of reach, and can attack 1 creature at a time. You cover you're fingers in at least 10ft of silk. As you whisper the incantation of the spell, a ember emits from the finger tips. as the flames burst on the threads a glow emits 5ft from the threads. The threads on each finger can do 1d4 fire damage. The spell has a  +3 to it.

When the spell attack misses, the damage the receiving creature is dealt is 0. When you are dealt damage you must make a concentration check(Constitution save) of 10 or have the damage you received(which ever is higher).

Endeavor's Fire Threads while cast at a 4th level slot or higher the damage of the threads grows to an extra 10ft reach, it also gains another 1d4 fire damage, in addition to a +1 damage