The Hounds show up seemingly attacking Harry and Eb but who were they really after?
In Lovecraftian mythos, the Hounds of Tindalos attack time-travelers and hunt them forever. Obviously they can be defeated but why send those beings specifically? There are plenty of nasty Outsiders to use as hit men.
The Hounds of Tindalos (or Cornerhounds) are supposedly creatures from Earth's distant past when other life was merely single-celled organisms. They are currently ruled by Mh'ithrha - the Arch-Lord of Tindalos. He is supposed to be invisible to the human eye, but his physical form is that of a gargantuan wolf (somewhat like Fenrir). He has also been engaged in a war against Yog-Sothoth for eternity. Curiously, this suggests that the Outsiders may not actually all be working together. Yog-Sothoth is also essentially the same as the Outer Gates, Cthulu is it's grandchild and Azahoth is his grandsire. Worse still, it manifests as avatars as it is too potent for the multiverse. The fact the Mh'ithrha has survived against this being is testament to it's might, I should think.
Also, Eb says that "they" (read: Black Council) sent the whole pack - 13 Cornerhounds. I think that's significant. Perhaps a mortal can only create 13 ectoplasmic bodies per entity. This would provide a limit on such an entity, unless they came through the Outer Gates (I suspect).
I suspect Mh'ithrha could well be Fenrir, in which Loki and Angrboda are at least part Outsider because the Fire Jotuns of Muspelheim would have to be Outsiders (and Surtur "the Black One" is their leader - perhaps an avatar of Azahoth?). This might also explain Vadderung's role in all of it, but we also now have seen the claws of his eventual killer (theoretically). Convulted, I know. But that comment by Vadderung about the Jotun's retreating is interesting.
Anyway, the first hound leaps at Eb...or does he? Harry says Eb puts a shield between them. Perhaps the real target was Harry? But either way, why send a time-travel hunter monster? Eb is more likely to have time-travelled than Harry (especially with his ability to break the Laws).
Or what if they were there for someone else...like Justine? Or perhaps Harry from the future in the background of the scene (unmentioned but there - like Avengers: Endgame).
What do you all think?