Looks like Chap 5.
Your FS shows signs of coordination with occasional push tourneys so you might have a shot at the 2 more artifacts from FA if you guys can finish all 3 stages.
Mine is currently at lvl 8 and I accidentally fed it while trying to feed my Fire Phoenix next to it. At 4%, I wasn't overly impressed. It was on Day 1/Round 1 of tourney, which is prob the worst time to feed it as it's the smallest army you'll face/use. I'm going to try to feed it before tomorrow's tourney and see if I can squeeze 2 rounds of tourney and Spire Lab action out of it. I don't reckon I will be that much swayed by its awesomeness because it still won't give me back as many troops as Brown Bear for the same Pet Food. I fight a lot and see this as an occasional niche feeding, like maybe during the brutal Dust tourney. I did have a laugh reading the wiki at the line "
Make sure to always keep it fed!" Yeah, we'll do that when you make sure to always give us Pet Food in the MA cycles...
I think in your shoes, I would not put it down yet. I would wait for it to come around to the Spire and re-craft the base in the MA. At chap 5 and awhile after, it gives more T3s, which most of us are already flooded with by the looks of the trader listings in both of my cities. If you put it down now and evolve it, you can only sell it or store it. Selling it loses your evolves. Therefore, if you're not going to bother feeding it most of the time, you might as well save yourself the Royal Restorations and recraft the base at a later chapter. In the meantime, hoard all the Pet Food that you can until you're filthy rich in Pet Food to be throwing them at a 5% revival.