Most mysterious creatures in Star Wars

The Star wars mythos is home to creatures that were mentioned briefly, occur on only certain worlds/settings, or are just rare in general. What creatures/beings have you read about in books or the games, that you always wanted to know more about but there is little info about them? What makes them distinct among the creatures in the mythos?

The Terentatek been appearing for a while now since the creation of KotOR, but I would like some more details on their origins since every sourcebook says a different story.

Battle Hydra, Zythmnr, Tuk'ata. I'd of liked more information on the Rakata although I probably just haven't read into them enough.

Originally posted by ILS
Tuk'ata

Mount Sorrow:

It's a mountain. With a face. That's sad. 😐

http://starwars.wikia.com/wiki/Mnggal-Mnggal

Mnggal-Mnggal's origins were shrouded in mystery. It was a completely unique being, without analogue even in species catalogs as extensive as those of the University of Sanbra. It was believed by some, including the Chiss, to be extra-dimensional in origin, and comparisons were made to other known beings such as Waru.[1][2] It was so ancient, at least by its own account, that it existed alongside the Celestials

Cephalons

Wait, Mt. Sorrow is actually a thing? I thought he was some Dora the Explorer character.

Bedlam spirits. Because naming cosmic beings after an insane asylum in England is totally going to end well.

Storm Beasts from Kotor 2.

Originally posted by carthage
The Star wars mythos is home to creatures that were mentioned briefly, occur on only certain worlds/settings, or are just rare in general. What creatures/beings have you read about in books or the games, that you always wanted to know more about but there is little info about them? What makes them distinct among the creatures in the mythos?

There is electromagnetic life forms.....

Arkanian dragons

http://starwars.wikia.com/wiki/Bear

I am still not sure who will win tj's Bear thread

Jawas.

Yoda's species.

Teezl !
http://www.starwars-holonet.com/encyclopedie/creature-teezl.html

Originally posted by psmith81992

http://www.starwars-holonet.com/encyclopedie/creature-teezl.html

This is mysterious as hell !!!

This is also terrifiying :
http://img1.starwars-holonet.com/holonet/dictionnaire/photos/crea_devoreur_espace_01.jpg

Devoreur from space !

/end thread

Gungans. Not that there is a lack of information on the species, its just that no one wants to learn about them