Well, fought Trias and got his blade. Killed him cause he lied to me. In trying to reach FOR, went back to the hive and Mortuary (good since I missed Deionarra the first time) Only portal I found is on the first floor, but when I step through it only takes me outside the Mortuary. Am I missing something?

Mhm. The portal is at the same floor, nay, same room where you started the game. Approach the centre of the room (the black hole) from the room you started in, and a dialogue window will pop up.

How ironic, isn't it? Travel all around the multiverse only to return back where you started the whole thing.

Ironic indeed. Thanks for the help, don't know how long I'd have been wandering around before I tried that.