Seraphim are more powerful than regular angels. Your physical form becomes much more malleable to the degree you are able to impersonate others or take the form of animals if you wish it so. Your well of divine energy is 5 times larger and you have 450 years of experience to draw from.
When assuming a physical form, you are able to contest an elder dragon for strength and toughness, the size of your chosen form affects your agility.