Monster is the collective name given to the children and descendants of Eve. They are supernatural creatures with extraordinary strength and powers, and commonly prey upon Humans. When they die, their souls are sent neither to Heaven nor Hell, but to Purgatory.
Elite monsters
These monsters are of the strongest type, either by being physically stronger than the rest (like with Dragons), or are so unique that it's hard for hunters to hunt. ■Dragons ■Jefferson Starships ■Phoenix ■Shojo
High-tier Monsters
These monsters are stronger than the majority of monsters, but not among the strongest. ■Arachne ■Djinn ■Shtriga ■Skinwalker ■Vampire ■Werewolf
Medium-tier Monsters
These monsters are about average in terms of strength and powers. They are also normally harder to kill than the Lower-tier monsters. ■Crocotta ■Khan Worm ■Rakshasa ■Siren ■Vetala ■Wraith
Lower-tier Monsters
These monsters are considered the easiest to kill, and possess the weakest powers. Despite this, they are still dangerous to hunters. ■Changeling ■Ghoul ■Kitsune ■Okami ■Rawhead ■Rugaru ■Shapeshifter
Unknown Ranking
These are monsters, who haven't actually appeared (yet), so their placement on this list is unknown. ■Banshee (Mentioned by Dean) ■Chupacabra (Mentioned by Gordon) ■Loch Ness Monster (Mentioned by Bobby) ■Lamia (Hunted by Sam and Dean, but never physically appeared in the episode)
Elite monsters
These monsters are of the strongest type, either by being physically stronger than the rest (like with Dragons), or are so unique that it's hard for hunters to hunt.
■Dragons
■Jefferson Starships
■Phoenix
■Shojo
High-tier Monsters
These monsters are stronger than the majority of monsters, but not among the strongest.
■Arachne
■Djinn
■Shtriga
■Skinwalker
■Vampire
■Werewolf
Medium-tier Monsters
These monsters are about average in terms of strength and powers. They are also normally harder to kill than the Lower-tier monsters.
■Crocotta
■Khan Worm
■Rakshasa
■Siren
■Vetala
■Wraith
Lower-tier Monsters
These monsters are considered the easiest to kill, and possess the weakest powers. Despite this, they are still dangerous to hunters.
■Changeling
■Ghoul
■Kitsune
■Okami
■Rawhead
■Rugaru
■Shapeshifter
Unknown Ranking
These are monsters, who haven't actually appeared (yet), so their placement on this list is unknown.
■Banshee (Mentioned by Dean)
■Chupacabra (Mentioned by Gordon)
■Loch Ness Monster (Mentioned by Bobby)
■Lamia (Hunted by Sam and Dean, but never physically appeared in the episode)