Using this ability, Mason could sense the loyalties of others. He will either see the loyalties surrounding a person, or simply know them, and will be able to choose which way he detects the information. He could sense if others were loyal to him, and thus know if they were using him, or planning to betray him. He could also see what other loyalties people have, in order to potentially use them against those individuals, or even just check if their loyalties and interests coincide. The ability would make it difficult for anyone to deceive him.