Yesterday our faction proceed to Arena of the Ancients also named as "El Antiguo Patrimonio" to explore and observe on how things go. And because it is my first time to explore this instance, I will share to you guys my experience.
First, because we are aligned to the republicans, we moved to the republican faction member located at Thueringen Lakeside in coordinates D6. Then a portal will be open once the notice announced that the portal is opened.
Then when we went inside the huge arena. After some minutes we encountered the Ancient Gerelo which gives the raiders some time to take down. After defeating Ancient Gerelo, a portal was opened to the middle, and our next adversary was summoned - Ancient Diablo! This time he does more punishment and he not an ordinary Diablo because his AOE (Area of Effect) has more range than the regular. After the raiders took down Ancient Diablo, decent number of level 100 chips was scattered on the floor. Luckily one of our faction mate got his share.
After the raiders defeated Ancient Diablo, another portal was opened that took us to two platforms. Unfortunately we seem to be stuck and the next anticipated boss does not show up. I don't if its a bug that Ancient Hell Breaker didn't shown up but this arena is really unique.