Chain Lightning of the Songbirds

When activated, you are granted +1 to attack rolls until the end of your turn, and add 1d4 lightning damage to attacks with the enchanted weapon.

You are also granted the ability to use your bonus action to make an extra attack with the enchanted weapon.

The weapon stores 5 charges of this ability at a time, and requires a short rest to recover 1 charge.

You can expel up to  3 charges at a time. Each charge does 2d4 targets for 2d4+1 lightning damage. Targets must be within 5 feet of each other to be chained and the lightning cannot double back. Add 2d4 damage if they are wearing armor made of metal or are primarily made of metal.

Activating any amount of charges is a free action.