Yes, whether you go into the Plane of Dreams or through some other magic, the evil quori can sometimes take matters into their own hands and appear physically. They do have stat blocks and are very tough creatures. Some of the abilities they have include immunity to being surprised, innate spellcasting, incorporeal movement, and even the ability to possess other creatures. If you do find one outside of a host, you are in for a very tough fight as they are psionic creatures and will cause a lot of damage to those with low wisdom saving throw scores. Additionally, several of the quori’s abilities trap the souls of dead creatures inside of its eyes, and nothing short of a wish spell can revive them. Again, most quori will remain inside their human host for combat, and will very rarely enter combat themselves. Still, if your players need a tough boss battle to end the scheme of the Dreaming Dark for good, this can be a good one.