Improved Armbar
From Compendium of Worldly Lore
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.