Ascension is the process of beating the last boss in ARK and ascending to the next level.
After you ascend, all the bosses become harder and drop better loot.
Ascension involves beating all the bosses, completing the Tek Cave (currently only available on The Island), and discovering the true nature of the ARK. The process involves sacrificing your character. You’ll resurrect as a new character holding a soul cube, and will with have a progressively increasing level cap (and if done again, taking on bosses that are scaled to be even more difficult and have some changes each time).
There are 3 achievements to be unlocked by ascending, awarding skins in addition to a higher level cap leveling out at 115!
The Tek Cave, located in the Volcano, is the final cave of the game and completing it will allow the player to undergo ascension. To access the caves, you need trophies from Broodmother, Megapithecus, and The Dragon of the appropriate rank, which in turn require you to have already acquired all the artifacts (or fought the bosses with somebody who did). Ascensions above Gamma require you to also have most of the special drops from Alpha Predators.
Remember to take some Ghillie Armor to deal with the extreme heat as this cave is really hot, so you also might want to bring some Calien Soup along with lots of Water. Best would be if you brought a lot of powerful ascendant items, such as several Rocket Launcher, a Tek Rifle, Tek Grenade, or any other weaponry. Ranged weapons can help you to aggro lots of wild animals in the cave and make them fall in the lava caves. It makes the cave a lot easier, especially if you can send the Giga in the lava. Some pro-tips include, bringing sacrificial tames such as Carbonemys with, to send into the lava once you have shot it with a Pheromone Dart, drawing wild Dinos with it.
Mounting very high level Rexes and bringing a Yutyrannus with to buff your tames makes the ascend much easier but once completed, you unfortunately have to leave those tames behind forever when you enter.
Upon reaching the Ascendant panel you transcend into the overseers quarters where you can explore all the logistics that seems to maintain the full functioning of all the various ARK or discover whatever mysterious experiments are being preformed on us.
After exploring, you will enter a room where you will see the complete ARKverse. Here you will encounter the Overseer standing on a platform in the shape of your own specimen implant. He will be accompanied by tons of very aggressive defense drones readily attacking on sensing your presence. Attacking these drones drops element, while the Overseer would morph into the various ARK bosses, needing to be defeated individually.
After defeating the overseer a globe will show detecting the originating ARK from which you ascended.
Congratulations, you have officially ascended and will be awarded that sweet increased character level cap that you can boost into fortitude. XD
Bonus: The Overseer’s Celestial Quarters