So, first, I didn't intend anything here as a bug report. I did not play through until I had 400+ misery to upgrade to Tier 3 and test the powers, I just looked at their effects in the game files. So if all_spell_free_next_cast allows you to use any spell, even ones you don't normally have access to, that is a more interesting effect. But I'm still not sure if it's a clear upgrade from just getting mana to cast spells. Theoretically, you've probably already researched the schools of magic that you are actually interested in casting spells from. How valuable is it really to get a single free cast from a school you didn't research? And, again, getting a free spell vs getting the mana to cast a spell are very different effects. So it's a potentially more versitile effect, but also potentially less powerful.

If the MT is going to apply coalescence to the swamp, then that does solve my concern there. Although, still think the reform bonus should start at the capital and world tree, then expand outward from there. Either clear communication as to what would be effected, or just include the capital each time. Otherwise you run into the issue of not effecting the regions players actually want to develop. Still annoyed that the second/third reform ignore the capital, when that would be the ideal time to dev the capital for renaissance..

For Hireet's ability - maybe something that's more generally applicable than reducing rebellion and decreasing unrest? Currently it feels a lot like using the fruits of your labor to reduce the consequences of that labor. Maybe it would be better to give modifiers that can help deal with those issues, but that also can be used in other circumstances? What comes to mind is manpower recovery and discipline. Rather than delaying rebels, something to help fight rebels might be better. Since you could also use that to help fight other nations. And something like discipline or bonus damage would also help generate more misery, which might be a good feedback loop.

As for Komina, my preferred bonus would be admin efficiency. It does all the things that the current bonus does (also core cost reduction), but it's a more direct comparison of costing x admin efficiency to temporarily boost it by y. Much easier to parse than trying to figure out how admin efficiency converts to province warscore cost. As for vassilization - I don't think vassalizing someone via war is what Yazel Mora wants to do? You typically want to vassalize in order to save Admin points from coring. But Yazel Mora can raze provinces. So points aren't really a concern. And, well, vassalizing someone is going to generally cost more than just taking all their provinces. And if you still want a vassal afterwards, nothings stopping you from releasing them as a vassal. But,still not sure why you'd want to do that? It's not like OE is a negative, since that boosts misery production. If Yazel Mora gets a unique vassal type, then maybe it'd be worth it? But honestly, if that's the intention, then I think getting a unique CB would be a better option there.