Deadly Fluorish

Jhin shoots a magic bullet in a line up to 5 by 60 feet line. The first creature it hits must succeed a Dexterity saving throw or take  3d6 fire damage and be restrained until the end of his next turn or if he takes an action to break free. On a successful save, the creature only takes half as much damage.

Lvl 1-3 = 1 charge

Lvl 4-7 = 2 charges

Lvl 8-11 = 3 charges

Lvl 12-20= 4 charges