The Wealth Hand and Treasure Hand in Tartarus are longtime enemies in the Persona series. These monsters have high resistance to every Affinity except for one. If you're just starting Persona 3 Reload, then you'll probably miss out on the Wealth and Treasure Hands until you can target their respective Affinity weakness. Although they can be a pain to chase down, defeating them in Persona 3 Reload rewards you with a ton of money and experience, making it worth the trouble.