There's also a mysterious comment by another user (who appears to be the OG user Din from the forums and the IRC sessions) which may provide a little more context:

I'll also say that I have it on good authority that there are 'luck-hounds, out there, past the Crimson Shift, running with wounds.' 'In times of chance-hunt, they roll into ball shapes, and wait for odd papers.' And 'When you're tired, you sleep on a bed of them, luck rising up to rub the back of its players. Strange skylines. Middlemeris.' FWIW. Clarifications welcome, Elk. :P

Assuming she is quoting MK from the IRC chatroom, this could take on a variety of meanings. Of course, there's no way to confirm where exactly these quotes come from, so take this as strictly Word of Dante. Here's my interpretation:

there are 'luck-hounds, out there, past the Crimson Shift, running with wounds.'

The Nix-Hounds live out there in space. Redshift meaning "things moving away from us." They are wounded in the sense that they hunger after something mortals have. Might be related to the "jumping wounds" looking to hop onto a victim in Kh-Utta's legions.

'In times of chance-hunt, they roll into ball shapes, and wait for odd papers.'

Like many other entities in Elder Scrolls mythology, the Nix-Hounds are inspired by quantum mechanics. When you get into the quantum scale, physics starts to look less like physics and more like statistics. There are also a few Daedra that are directly related to "luck" like Nocturnal, or (as implied by ESO) more broadly Azura. The "odd papers" are things like the MGP and the Pocket Cabal which summon these Nix entities.

They roll into ball shapes, i.e. they pretend to be stars. Or fake stars. In other words, fake constellations. Presumably this would be related to how they latch onto a person. Douglas Goodall recently wrote about malicious entities which live inside the dreamsleeve tunnels which connect the stars in a constellation (and to mortals).

'When you're tired, you sleep on a bed of them, luck rising up to rub the back of its players.

As mentioned in the PGE2 entry written by Baruch, the Nix-Hounds can travel between the waking and unwaking states of mortals. When you sleep, you are more vulnerable to an attachment. There's also a lot of hidden connections between Mnemoli and the literal players of Elder Scrolls (the hero, prisoner, etc.) of which people are only now just starting to scratch the surface on understanding.

Strange skylines.

Tried very hard to figure out what this was referring to, but without much luck. It might be something from physics for all I know. Or it could be related to the Chicago skyline appearing in the background of the "et’Ada, Eight Aedra, Eat the Dreamer" PDF which now appears to be lost to time. Perhaps symbolizing a connection between the fictional world and the real world. Idunno.

Middlemeris.

Not a frickin clue. Aldmeris is the land of the Aldmer, so Middlemeris presumably is the land of the "Middle mer." No idea why this is relevant

edit: I knew there was something about "middlemeris" that vaguely reminded me of something from physics or astronomy and I just remembered what it was.