In Game Description
Comes from a now-inactive ancient Ruin machine.
Even the great techniques and unknown power of this device must come to nothing should the machine that contained them ever fail to maintain structural integrity.
Usage: Weapon Ascension
This material used as ascension material for these following weapons:
Where to get Chaos Axis?
Chaos Axis can be obtained by defeating Ruin Sentinels, a machines type enemy that only can be found in Inazuma. You can also get Chaos Axis by transmuting 3x Chaos Gear in alchemy table.
Here’s all locations where you can farm Ruin Sentinels:
Araumi, Narukami Island
First area is Araumi in Narukami Island. For location number 1, you can find Sentinel Ruin in the path near underground teleport waypoint. About how to open the location, please read: How to Open Underground Teleport Waypoint in Araumi.
Second location can be found near the ruin. As for third location, it’s depend whether there’s Leyline Outcrop or not.
If you’ve find Leyline Outcrop in the area, whether it’s the blue or yellow one. Open it and 3 or 4 sentinel ruins will appear. You can just defeat them and taking their drop without claiming Leyline Outcrop rewards.
Inside a cave in Kannazuka
Some sentinel ruin can be found inside small cave in Kannazuka. There’s 2 entrance to this cave, first one is hole near Thunder Sakura. Second entrance can be acessed from the beach (check marked location).
First location can be found in Fort Mumei area, you can find 4 sentinel ruins in there. For second location in Serpent Head, it’s located underground. You can open the gate by guiding 2 electro seelies in the area.
As for third location, it’s also located underground. You need to solve puzzle before unlocking the whole area and farm sentinel ruins.