Hmm, interesting. Nothing warned about the one-way-ness of it all, and I'd thought being able to go back and forth was normal. (And a good thing, because I needed an extra, like, 70 health potions.)

The teleporters out of the battle tower don't work so I'd assumed that I was meant to be able to retreat and heal but not to go anywhere else.

When I stop being monitor-punching irritated with it I'll go back to a pre-hall-of-echoes save I guess; something seems to have gone drastically wrong with that one. And as for leveling up, no dice. :-/ I'm at about 35.5 and there is literally no quest left incomplete or mob left unkilled that I can find anywhere. I respawned that flying fortress with the door and statues twice before but got bored with it.

The memory eaters... I don't even know what it is, I have my "auto pause if life points low" feature set wicked high now (I didn't bother using it for most of the game) and it never even gets a chance to kick in. In Dragon form I have something like 1300 and change HP, and I go from 1000-ish to 0 before I even get a chance to hit pause. I'd been progressing through the Hall of Echoes by compulsively saving and popping back to the battle tower each time I managed to take out a Nest Dais.

In light of this new information, I suppose this post should actually be called "Bug: I can go back to Battle Tower after entering Hall of Echoes!"