Submission Fighting

You’ve improved your close-quarters grappling skills. You gain the following benefits:

• As an attack action, you may attempt to suffocate a creature pinned by you. To do so, make another grapple check. If you succeed, you deal 2d6 necrotic damage for each consecutive round of successful Grapple checks, using this trait, against that creature. You also add your strength modifier to the total damage dealt. This trait has no effect on a creature that does not breathe air to survive.
• You can use your attack action to force a creature pinned by you into submission. If you choose this special attack, the pinned creature must make a CONSTITUTION or CHARISMA saving throw vs. DC 10+ proficiency+ STR modifier. On a successful save there is no effect, on a failed save the creature is no longer hostile toward you. This trait has no effect against a creature with INT lower than 8 or UNDEAD.