Apparently the tome needs a buff from a tusken raider mob called "Sandclaw". unknown if he's actually ingame or not :\
Okay, this makes me more confident that this has something to do with the Queen of the Sand(s). She's not in-game yet so when they add her maybe they'll involve the tome with her spawning.
I'm guessing they'll introduce a new WB in 2.4 or 2.5 so let's hope for a KRAAAAAYYT DRAAAAAAGON!