Bone Breaker

Name: Bone Breaker
Requirements: 20 or more starting strength, MMA Job
Stamina cost: Passive
Downside: Passive, only works with MMA moves. Limits user to punching weaponry and blunt weaponry.
Post duration: Passive
Type: Passive effect
Range: Passive
Base Damage: N/A
Other Damage: Broken Bones
Level needed: 1
Rp Sample link: Atlas slams his opponent into the ground using an MMA move referred to as a Spinebuster. (There is a dice roll where the lower half of the numbers are fail and the upper half are success. A 6 is rolled on a 6 sided die.) The opponent has a rib broken from the impact of the move.
Description: Whenever the user uses an MMA move against an opponent with less health than the user's strength there is a 6 side dice roll. If the roll is a 1 2 or 3 the opponent has no broken bones. If it is 4 5 or 6 there is a break.

i can see 6 as a critical break. other then that i see no problems with this skill. how ever i think on soft grounds like marsh lands or in snow the breaking rate is 5-6. so if you think this is fair let me know.