Cato Neimoidia -Tarko-se Arena | Hidden holocrons SW: TFU II Guide
Last update: 11 May 2016
Once you're below the arena, get on the elevator, but don't ride it to the very top or the two holocrons here will be lost! You have to wait for the lift to be a bit above the holocron visible on the other side of the cave and perform a double jump and a Dash in its direction.
EXP Holocron.
The second holocron is a bit easier to reach. Once you take the first one, don't jump down to the very bottom, but search for a small ledge - it's hard to notice, but you'll find it eventually. Jump onto it. The holocron is just a double jump and a dash away.
Saber Crystal: Corrosion
You can deal corrosive damage.