Great, Martial, Straight Blade
You add 2d12 force damage to attacks.
Once per long rest, you can choose to cause shatter at 2nd level when you attack with Atomsplitter. The area is centered on you, and you are also targeted by the spell.
If you critically hit with this weapon, you regain the use of the shatter effect. If you critically hit, without having expended the shatter effect, you must use it.