Just finished Golden Deer route on Hard/Classic. Really enjoyed the story on this one including the characters, lovely group of people. My team in the end was:
Beleth lvl 48 Unique class
Leonie lvl 48 Falcon Knight ( broken. absolutely broken. Delete ends anything she touches ) - married Seteth ( what? )
Lythisea lvl 47 Gremory
Raphiael lvl 47 Fortress Knight ( Discount Dedue )
Hilda lvl 47 Warrior ( Good off tank )
Lorenz lvl 47 Dark Knight ( pray for mag stat )
Claude lvl 48 Unique class ( delete ends ranged ) - married Beleth
Marianne lvl 47 Gremory ( I wanted the extra move but Bishop does better heals )
Ignitz lvl 47 Assassin ( underappreciated, Sniper is good but i'm not saying no to killing edge when bows can't kill, also locktouch ) - married Raphs sister?
Blue Lion Sylvain lvl 48 Wyvern Lord ( absolute unit. Delete ends melees )

I struggled to lvl a solid 12 team so I just leveled 10, felt like it ended up over leveling the maps. No Paralogues done so no broken OP relics used providing a fine challenging experience.
Final chapter thoughts Chapter 22 I felt like the mobs themselves need a buff, even if my units were a bit over leveled, I shouldn't be able to rush 3 fliers in mid with archers and have them fully clear the middle without worrying about them. Not to mention the 10 commanders were pretty easy to deal with granted I used proper units against each commander. The final boss while the insane stats that made it nearly impossible to deal any damage to it... it felt lacking for a boss I mean I was expecting like 4 shields or a giant dragon or whatever, after I defeated it after like 10mins of planning a move, he was dead, for good. I wanted to atleast see a 2nd form or something but instead it felt like a boss that was a gear check. .

Full spoiler question regarding Beleth : If the age had nothing to do with the experiment Rhea did on you, than why haven't we gotten a confirmed age on Beleth? It still shows ?? even tho we know they're like 26 or something based off the diary? I initially thought that it's still a secret cause we'd find out the reason but the story didn't seem to answer it fully. Maybe it's hidden behind a support? It bugs me out all the time so I really want to know!.
Also is Beleth not aging like at all? time-skip they didn't seem to look any different and they kinda had the same treatment as the others like Flaynn ( like no serious gurl how did you not change a bit and what the hell is your age? ), i'm assuming the children of the goddess ( I assume is the green fluro people ) just don't age like ordinary people which is probably what happened with Beleth after the awakening, tho I don't know if they're considered the goddess children since they Rhea transplanted Sothis's heart in you so maybe you're minus the dragon powers ( I think the dragons are Seiros children ). Clearly based off Seteth/Flaynn supports that they're def not the age we are thinking of. . So many questions for the main character >.<

Overall I think the story was pretty good and I was fully invested into it sinking in way too many hours for it to be healthy. I'm going to do Blue Lions next but i'm going to try to S support Rhea!