I had Erris up both yesterday and today in my Garrison. Both days I got the pocket lint and 3 battle stones.
Day 1 was the flying pets. I chewed them up with Emerald Proto-Whelp / Emerald Whelpling and another pet that I don't recall, lol. The Proto-Whelp solo'ed the first two, then I switched to the 3rd pet that I don't recall since the last pet was not a flyer.
Day 2 was the 3 critters. Xu-Fu did work against the first two, then my Deathwatch Hatchling got to play, mostly because I just wanted to use him.