Yeah, turns out no matter the amount of feats or WBL you invest in your mount, unless you're going with a class with a built-in mount, it's going to be extremely squishy at ECL 20 (and arguably, even then). So I hope the Knight's class feature will do its magic. Besides, it'd be funny if it'd force the monsters to squeeze in the passage.

Nice RP for Delja. The dynamic with Myriad is really cool.