Is WoL the only one able to master/handle all the classes at once?

[MrThinker]

Can you provide a source for your claims as I am unable to find any mention of a "drain" on a person's aether within the soul crystal lorebook entries that I've thus far been able to find. Furthermore, I've looked over the level 80 DRK journal entries and have found no mention of this "unattunement" that you speak of.

While I can't speak for the lore book entries, for the lvl80 drk quest journal entries, certain passages written by Fray only appear if you are wearing the dark knight soul crystal. If you take it off, those passages disappear.