Electroconverger, Level 1

As a standard action, shoot a bolt of lighting in a
60 foot line. Each creature in the line must make
a DC 13 Dex saving throw or take 4d6 lighting
damage or half on a saving throw.
Each time you use the electroconverger, roll a d10
and add the number of times you have used it
since your last long rest. On a 11 or higher, you
malfunction and take 4d6 lightning damage and
can't use again until your next long rest.