Ring of Lightning Strikes

Your unarmed strikes deal a bonus 1d4 lightning
damage, and, when you deal damage with an
unarmed strike, the ring gains 1 charge (max 20).
As a bonus action, you may spend 20 charges to
gain the following effects until the beginning of
your next turn:
• Your unarmed strikes gain a range of 20 ft,
and an area effect of 10 ft
• The rings damage bonus is boosted to 1d8