If creatures who share a permanent telepathic bond spend enough time around each other, they can eventually learn to operate as a non-verbal hive mind. In battle, they coordinate their motions into an instinctive, beautiful, deadly dance. They can become so synchronous that to an outside observer they may seem like a single entity inhabiting two bodies. However the mind of each creature remains distinct, their separate identities are preserved, and they retain their natural autonomy.
Someone with this feat has advantage on attack rolls against another creature - if at least one of the attacking creature's allies also has this feat and is within 5 feet. The attacking creature does not have advantage if the ally is enchanted, possessed, under any kind of mental compulsion, unconscious, or otherwise absent from their own mind.
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