Phil Spencer was wearing a Hexen t-shirt on the 2023 Xbox showcase, which I found rather curious. Such things aren't done at random, and Hexen is a weird one to foreground given how long it has been dormant and how it is nowadays only familiar to dedicated retro FPS fans.
My guess: MS doesn't have its big exclusive souls-like whereas Sony has a couple. Hexen has grim dark fantasy setting, exploration of interconnected locales, boss fights, multiple classes to chose from, basic leveling in the case of second game. So one can look at Hexen and see a vintage IP whose name can be used for a major exclusive souls-like.