Angels are powerful celestial beings of light created by God to serve as his attendants and messengers, but also as his soldiers and warriors in his war against Lucifer and his demons. They are native to Heaven and are imbued with considerable power.
Angels are one of the most powerful entities in the series, generally outclassing all demons, monsters, ghosts, and other supernatural creatures with the exception of the Leviathans, Eve, The Horsemen, The Darkness, and God himself.
Angels are capable of reproducing with humans while in a vessel, creating a Nephilim. However, if they're missing their grace, the resulting offspring will be human. They cannot reproduce in their natural form, and it is unknown what is born when two angels within vessels reproduce. Angels are also among the most recurring supernatural beings in the series.