*revives another dead thread, FFFFFUUUUUUUU-*
Finally, he has his OWN FORTRESS ON ANOTHER DIMENSION.
I don't think Kalmar's fortress is in another dimension, dude. When I first saw that scene, I could have sworn they were on top of one of the citadels.
And Dirk, well... I developed this theory that Dirk is actually Tetzel. That would explain why he knows everything about The Way, and Tetzel should be the closest thing there is to a Forerunner. Or then he's Eyashu who isn't really dead at all.
The Shadow Man from the Pits? I think he's just the manifestation of Night Reaper, just like Phantom Slasher is the manifestation of Rhue's sword.
I'm also one of the people who think Ghost Horror went to Lyrra. You remember the sword stuck in the floor when Slade wakes up in the Blood Lyn ward? We see Lyrra and a Blood Lyn barreling past him and then there's a scream, and later a bloodied Lyrra runs screaming bloody murder after Strata, holding that same sword.
Serena... I doubt she's just an "ideal". Slade and Scatha certainly seemed to know who she was, so she did exist.
*points at her avatar* In case you're curious, this guy is Tetsuya Onodera from Super Robot Wars OG. He's the vice-captain of Space Noah class battleship Hagane and my favorite character in the games (alongside Gilliam Yeager).