Green-Flame Blade

Casting Time: 1 action/Range: 5 ft.
Duration: Instantaneous
As part of the action used to cast this spell, you
must make a melee attack with a weapon against
one creature within the spell's range, otherwise
the spell fails. On a hit, the target suffers the
attack's normal effects, and a green fire leaps
from the target to a different creature of your
choice that you can see within 5 feet of it. The
second creature takes fire damage equal to your spellcasting ability modifier.