Battlefield Reaper

You make certain that the wounded, fallen, and fleeing will not return to further torment you and your allies. You gain the following benefits:

• Your successful attacks against creatures that are Prone are always critical hits.
• You have advantage on attacks of opportunity against creatures that are missing any of their hit points.
• As a bonus action, you can assess the health of one creature within 60 ft. that you can see. You learn if it is "badly injured" (has less than half its hit points remaining), or "severely injured" (has less than a quarter of its hit points remaining).