Blood Source Demons

These two unnamed demons acted as a source of demon blood for Sam Winchester.

Powers and Abilities
These demons appeared to be regular low-level demons with the powers of ones.
 * Demonic Possession - As demons, they needed a vessel to walk the Earth.
 * Immortality - As demons, they would never age or die unless killed.
 * Invulnerability - As demons, they were invulnerable to normal methods of harm.

Weaknesses
As regular low-level demons, they possessed all the weaknesses of ones.
 * Devil's Trap - Like all demons, they could be bound by a devil's trap.
 * Demon-Killing Knife - As regular low-level demons, they could easily be killed by the knife.

Appearances

 * Season 5
 * Swan Song