Wonderfully done again, Maximal. I know these are commissions but it's clear you're knocking it outta the park, and making your commissioneers quite happy... and the rest of us to boot. Buildings are rare enough, but for lesser-done factions like Centaurs/Harpies it's a real blessing. And of course, I do so love how you nail the Warcraft-y style (when your commissioners allow it

). Even though I'm probably not going to be able to make use of any of these, it's a fantastic addition to the database & I'm very glad Galendor was willing to share.
Recognizing that these are commissions & that I'm no artist, I'll say just a couple notes of constructive critique as I see it:
- The 'horseshoe' of the caster barracks is super thematic & cool, but I'll admit I didn't see it until it was pointed out. Feels like it's a tiny bit too 'long' & bulbous at the ends; if the intention is to get that across, I might suggest making it more circular.
- Any 3-tiered custom building is a good HQ, and this one checks the box. I do think though (as someone who has spent too long analyzing the OG town halls & how they 'advance' from tier to tier) that the 'development' is somewhat underwhelming. T1 > T2 basically just adds awnings & torches & spears, and T2 > T3 just adds the big (admittedly very cool & thematic) horn. Doesn't even noticeably change size, much less composition (like the Human & Orc HQs).
I love when a fellow faction designer puts this much thought into their requests. ^_^ I don't know anything about the Centaurs of the Dragonflight expansion but clearly you've done your research.
I think a more generic fertility deity might've worked slightly better (all the 'statues' among the OG Altars are extremely generic, only vaguely recognizable as their race, even), but the Theradras is quite good & as simplified as it could get.
Again, thanks for being willing to share this great pack.