This Blessing was made by Arianna Crowe as a variant to the Blessing, Spellbind. She used it to prevent the harm that came from the repeated attacks from the person currently known as Aurelia Black. The two of them have constantly be at each other's throats ever since the collapse of the House of Rivers for some unknown reason.
When you use Spellbind, Ruinous Force binds itself into the very bones of your target, restricting certain physical actions that they may make. Your target must make a Fortitude save or take a -6 penalty to any melee attack roll and have their critical failure range increased by 3 for their next 3 melee attacks. Once you use this Blessing, you must wait 1d10 + 1 rounds before you can use it again.