Thundercrash

You leap into the air  surrounding yourself in lightning, once you land the lightening surrounding you is released in a explosion's in a 15ft circle. This spell can be used as a form of mobility and as damage.

If used for damage.

Your target must make a dexterity saving throw, if the target fails he and surrounding enemies are hit with 2d12 lightening damage. if the target succeeds then only the target takes half 2d12

If used for mobility 

The area land is devastated from the crash and the can be heard from 300 ft. 

If you Miss/Use for Mobility. 

Roll 1 percentile die. if under 50% the character takes 1d10 lighting damage.