Mercury's magic Railgun

Range:250/1000

Rarity:rare

Loading(single shot)

3d8 piercing

Over charge(1min): As bonus action can turn safety off on elemental cystal. While active remove loading property. When make attack roll 1d20. On a 1 gun explodes in 5 foot radius sphere. You take 8d6 lightening damage. Everything else gets dex save for half. A hostile lightning elemental appears in nearest unoccupied space having escaped the gun's magic cystal. After 1 min passes gun stops functioning tell next long rest