arm of storm

you add 1d8 lighting damage to your unarm strakes and it increases to 2d8 at 10th level and 3d8 at level 20th leaves

you can make a sword from the lighting you arm the swords does 2d8 lighting damage and makes loud crackling sounds for 50 feet and makes bright light for 50 

when you use a idem made of out of metal you add 3d6 lighting damage to the originals damage 

you can make the wind sounding your arm doubled you speed but you can cast any spells on your next turn 

you can cast 

Lightning Lure

5 times a long rest each Thunderous Smite and warding wind

4 times a long rest each Lightning Arrow and Storm Sphere

3 times a long rest each Destructive Wave and Chain Lightning

2 times a long rest each Whirlwind and Control Weather

1 times a long rest each Power Word: Kill

Notes: lose a arm and get struck by lighting