Upon reaching 99, the Nexus world is really opened up. You can now start acending the Marks by the way of selling exp at places like Sunset weaver. A brown dye is also accessable from the arena dyer guy. Polearms are also now weildable, and one can now join an NPC subpath. Dragon cave is now able to be hunted in, which means you can now enter all of the mythic caves.