Juru

The Valley of Juru is a Alternate Reality that has a dark wooded area as a setting. It is where WordKillers alter-egos reside.

History
When Kara consulted the hologram of her mother about a mysterious symbol, It was identified as a glyph that predates recorded history and originates from Urrika, the continent on Krypton where life first began. The hologram then explained that the symbol came from Juru who she claims heralded the birth of modern Krypton, but any records of old superstitions related to Juru had been wiped from historical records.

Thomas Coville revealed he knew about archaic Kryptonian passages that spoke of the Juru, who it turns out were responsible for the creation of the Worldkillers.

When Lena started to work on Sam's condition after she promised to help her figure out what is going, she ran some tests on her including one where Sam was seemingly transported to another dimension where She began to fight her alter-ego "Reign". After waking up, She told Lena about the event. She then went back into the pocket Dimension and confronted Reign who told her to surrender her life before she woke up again and then decided to back there and fight Reign who threatened to Kill Ruby. Sam wakes up again and asked lena to go to Supergirl or the D.E.O. for help but she refused to do so however she promised that she would not let anything bad happen to Ruby. After the two other WordKillers found Lena's lab and broke Sam out, Reign completely took over again and sent Sam back to the Dimension as she and the others flew away.

Sam then woke up in the other dimension and Found Grace's dead body as well as Julia who she tried to help by looking for Safety. Supergirl was then knockout and sent to the dimension by a ritual that the three WordKillers began by covering the sun in darkness with the moon and creating an eclipse that diminished her powers. In The Dimension, Kara saw Julia and Sam before waking up.

Later on with help From Brainiac 5, Kara, Alex and Lena Luthor traveled there in order to find and help Sam and Julia and in the process Lena called out Supergirl for not revealing her true identity due to the fact that she doesn't trust Lena due to her family and their reputation. They also came across a Kryptonian Demon in a wooded area which they disposed of by throwing a stick through it.

Inside the Valley, they found Sam and convinced her to wake up and tell them where the wordkillers are by using the memory of Ruby which worked as she gave them their location by putting a crystal in a slot which made the fortress visible to the legion ship. However Reign was put back into the dimension in the process and attacked Lena. Supergirl offered herself but Reign declined her offer as she prepared to kill Lena. In the Physical World, The two other wordkillers realized Reign was not the same after breaking the ritual and Pestilence attacked her by slapping her in the face which caused reign to come back to the surface. Mon-El then ordered Brainiac 5 to wake them all up and get them back to safety which he did.

Trivia

 * In comics, the Valley of Juru was a region on Krypton which gave rise to a group known as the Wizards of Juru, a group well-practiced in magic and sorcery.The Valley was located on the continent of Lurvan which was among the unexplored regions of Krypton as a few Kryptonians knew of its existence and even those who did couldn't find it.Even Kryptonian technology could not break through it.