I got to Blood Peaks in Star Trail through the route that let me keep my items, but now I am stuck in the first level: I explored everywhere, and the only places left are through two doors that refuse to open, even though I have three fighters with 20-21 strength and three magicians hitting them with Foramen. My mage cannot cast Transversialis, even though they could in the last game so am I fucked?

Can you pick the lock?

I put my two stongest guys in front when I try and force a door open, Im guessing you know that already though.
I know a couple times I have reload in the pit and found that I could now pick or force a lock I couldnt before.

I could not get the door open, so I just gave up and edited a character to have Traversalis and Melt Solid, which is apparently also required. I figure that if the skills are mandatory and I only use them when I have no choice, that is not really cheating.

Well thanks for the heads up, You needed both of them?

You're welcome. I have not needed Melt Solid, but I heard it will be required in the final dungeon.