kleiner Pyroconverter

A Pyroconverger is an Izzet-made flamethrower. It carries a risk of malfunction each time you use it.
This is its pocket-version. As an action, cause the Pyroconverger to throw fire in a 10-foot cone. Each creaturethere must make a DC 13 Dex save. Fail:
1d6 fire damage. Success: half as much damage.
When you use the Pyroconverger, roll a d10 + the number of times you used it since your last long rest. If the total is 11 or higher, you take 1d6 fire damage,
and you can't use the Pyroconverger again