Tephra Cave

Tephra Cave is an area in Xenoblade Chronicles located in the right leg of the Bionis. It connects to the Bionis' Leg. Much of Tephra Cave remains unreachable until the Mechonis Core events.
==Geography==
Tephra Cave is a network of caverns located inside the Bionis' shin and populated by several types of monsters, most notably Arachnos, Vangs, and Caterpiles. Springs and pools of water can be found at various points. Ether lamps have been installed throughout the cave to help guide travelers.
Near the entrance is the Mag Mell Ruins, the remains of an ancient High Entia ship that has been embedded in the cliff face. The Colony 9 Defence Force uses the ruins as a training ground, storage, and a convenient source of ether cylinders. Heading to the second level of the ruins, there are two functional automatic doors; the door at the back leads around to the Rear Entrance where the Cylinder Hangar is located, while the right door leads to the Escape Pod Bay and the path toward Colony 6. Further in is a large spring area with several waterfalls, with a path leading to the Arachno Queen's Nest on an upper level. Past the queen's nest is the exit to the Bionis' kneecap, a vantage point from which both the Bionis and the Mechonis can be clearly seen. From here, the only way to reach the path to the Bionis' Leg is by climbing up to the ledge above.
When the Bionis is awakened, additional passages that had previously been blocked off by landslides are opened. Of note, the path by Vilia Lake passes along the Bone Corridor and through further Arachno lairs before wrapping back around to the upper level of the lake and the Arachno Queen's Nest. The ruins of a Giants' tomb can also be accessed along this path.
==Story==
Shulk, Reyn, and Fiora first pass through Tephra Cave together to collect ether cylinders from the hangar to power the wrecked mobile artillery.
After setting off from to get revenge on the Mechon, Shulk and Reyn head through Tephra Cave once again to get to Colony 6. Passing through the other door in the Mag Mell Ruins, they soon come across a group of dead traders whom they bury before stopping to rest. As he sleeps, Shulk has a cryptic dream in which a mysterious voice tells him about changing the future and the "True Monado". He then sees a vision of Reyn being killed by a giant Arachno before he is awakened and finds that they have been surrounded by smaller Arachnos.
They fight off the monsters, and Shulk contemplates his dream as they continue until Reyn is suddenly captured. Heading deeper into the caves, Shulk catches up to Reyn at an Arachno nest, where the giant Arachno from his vision appears. Just as Reyn is about to be killed, he is saved when Shulk activates a new ability from the Monado. Once the queen is defeated, Shulk realizes that the visions he sees are not absolute, and that the outcome can be changed. The pair then emerge onto the kneecap and take in the view, unaware that they are being watched.
==Locations==
===Ground Floor===
* Caterpile Nest
* Escape Pod Bay
* Forgotten Cave
* Hidden Warehouse
* Tephra Cavern
* Warehouse 2
===First Floor===
* Bone Corridor
* Emergency Warehouse
* Prayer Room
* Soothsayer's Crypt
===Second Floor===
* Arachno Feeding Lair
* Arachno Queen's Nest
* Kneecap Hill
* Path of Absolution
* Trader's Stopover
==Landmarks==
===Ground Floor===
* Mag Mell Ruins
* Rear Entrance
* Spring of Grief
* Tephra Path
===First Floor===
* Vilia Lake
===Third Floor===
* Leg Pass
==Secret Areas==
* Bafalgar Tomb
* Heavenly Window
==NPCs==
* Shura (Post-Mechonis Core)
==Enemies==
==Collectables==
==Heart-to-Hearts==
* A Scene Revisited
* Glowing in the Night
* The Legend of the Spider
==Quests==
==In other languages==
==Gallery==
XCDE area menu image Tephra Cave.png|Menu image in Definitive Edition
Tephra Cave DE.jpg|Area preview of Tephra Cave in 
Tephra Cave DE 2.jpg|Area preview of Tephra Cave in Definitive Edition
Tephra Cave DE 3.jpg|Area preview of Tephra Cave in Definitive Edition
Category:Areas (XC1)Category:Tephra Cave
it:Grotte di Tephra