Wyverns of lightning

You unleash magical lightning that takes the form of two wyverns that obey whatever you say.

The wyverns use the same stat block as a normal one with these changes 

The wyverns bite and stinger attacks deal an extra 12 (2d6) lightning damage.

The wyvern also has the following trait Lightning Breath (Recharge 5-6): the wyvern exhales lightning in a 60-foot line that is five 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 succesful one.