You conjure a wyvern made of lightning. The wyvern uses the same stat block as a normal one with these changes

The wyvern is a chaotic neutral elemental.

The wyvern's sting and bite attacks deal an extra 5 1(d10) lightning damage.

The wyvern has the additional trait: Lightning Breath (Recharge 5-6). The wyvern exhales lightning in a 60-foot line the Lin is 5 feet wide. Each creature in that line must make a DC 16 Dexterity saving throw taking 55(10d10) lightning damage on a failed save or half as much damage on a successful one.