Needs review
Source: Homebrew

Description: You can break your opponents limbs while grappling from seemingly anywhere

Prerequisites: Improved Grapple, Base Attack Bonus +10, Armbar

Required for: Greater Armbar

If you successfully grapple a target, you may take a full round action to break their limb. Roll 1d20+ double your strength mod versus the opponents Strength check (d20+STR mod), on a success you deal 1d4 STR damage.