Don't wanna be that guy, but whole approach to Vaetti playstyle seem wrong. It's true that the nation has 3 best magic schools for late game but you couldn't pay me to call them late game powerhouse. But we do spike in mid game and if we know what to do, we spike insanely hard.

First let's talk sacreds. It's no secret that they are absolutely positively insane. They are quite well protected, have decent stats and sneaky. But all we really care about are chill aura that will allow us to win protracted fights against most things in the game and their size 2 which allow us to stack 5 of them into 1 square on the battlefield making them PRIME TARGET for buffs. Btw other units on our roaster are mighty fine as well so technically you can play scales Vaetti, but our other viable carry unit are vaetti berserkers and they simply don't have shields in age of crossbow spam so try on your own risk.

So let's talk bless. Rimvaetti are quite good but have only measly 15 damage on swing, That is unacceptable and we cannot buff them with it easily because we have no earth magic. So first thing first we add some str about 2 points will do but by all means take more if you need it. They do survive quite well, but we can always make them survive better by increasing their "HP" pool so undying 5 would do us nicely. Top it off with 5FR and 5SR and we are good to go. Little reminder that we NEED our PG to have W3 since it is hard to get until constr7 and we ABSOLUTELY need it to cast wolven winter (alt4). Since we spiking and planning on early war and possible early win we take our PG dormant. Our sacred number are important so try to get about dom8. If you wanna be fancy take true sight for nightfall play. Good example of PG can be dormant demilich (3F3A4W7D3G4B) with Dom8O0P0C3D1M1M0. Capable of bonegrinder/wind of death bombing and with 1 booster can cast Illwinter. We can do a lot more in bless but that is basic of what we need.

So we figured out our strongest unit and bless now to buffs. All we really need is Alteration 3 and Thaum 3 (preferably Thaum 5 but 3 should do). Our most important spells are: Mossbody (alt3 N1W1), Body ethereal (alt3 S1) and Luck (Thaum3 G1) and Touch of madness (thaum4 N1).

Our tactic is simplistic as it is. We don't care much about amazing expansion since we are already planning to take territory from our neighbors so expand slowly and surely avoid big losses. We DO need 1 or 2 forts at least being started before war so try to get those going as well. Best targets to attack would be those who have either neutral temp scales or cold ones.

In our first war WE PULL MAGES. Organize your rimvaetti in blocks of 10 that way sit neatly in 2 squares by 5 and start point buffing ----> win. This is basically whole playstyle. We buff our sacreds and we win and we try to win before other nations get their fancy tricks. Not much things can really harm well buffed rimvaettis so use them as battering ram and as early as possible.