Memory LaneLV 103+

Dodo devoured part of your memory while you fought it, so you cannot pass Memory Lane. Look for the Memory Keeper at Time Lane: Memory Keeper's Room.

To recover the memory, return to where your adventure began and talk to the NPC who performed your 1st job advancement (Grendel the Really Old for Magicians, and so on). In-game this last part is the separate quest "Seeking Lost Memories".