I'm up to 23 Conquest after having diverted to get some 2nd gens. Velouria is a major part of the army and also the one my avatar married. Makes quite a pleasant wife...and I do like the variety of voiced clips/interactions you get in the household.
Anyway, Percy has worked perfectly as a solid new wyvern that was useful to get Ignatius. And Ignatius is like having a second Effie, which is high praise.
I've allowed some unfortunate casualties on the way, because Fire Emblem. The one that hurt was Nyx earlier, who I liked to use and was set up with Xander. I've made sure to keep Siegbert active but safe. Others were Shura who was at one time a solid second healer and...Camilla, who I had rarely used actually so...eh, see ya in the cutscenes.