[Cohen]

Personally Edi, I don't see the point of the Spell aggression.
Abysya usually has claims on Blood, and yes, some blood spells are now better because they don't require slaves.
Hellbind Heart is a sort of Enslave Mind now, more coty in fatigue term, and at the same level of magic skill (don't forget the lvl of magic required is added to the chance of resist, don't recall if halved or less however).
And for Sabbath Mastery/Slavery, who'll us a spell that makes your slaves starting with 100 or 66 Fatigue? Considering Reinvigorate doesn't work if casted after (tried on battlefield) by the Master.
So on, considering Abysya goes to Blood-9 research, with all his research problem (having a discount of 20 gold for each warlock apprentice won't make that difference, it's always 1 warlock at turn because capitol only, and you gain 1 scout or heavy inf more), probably those spells will be more useful to someone else, considering many of the pointed spells aren't blood.

I'd agree the Gem requirements were done to make them more difficult to use, but they've already a good level of cost, and not everyone could use communion. And AI waste Gems very quickly. I'd like to keep some spells with an higher gem cost but to lower their fatigue cost, however dunno if you ever tried Solar Brilliance in battle and checked his effectiveness ... it isn't so effective and could blind your units too.

For Caelum, what to say ... they've among the best mages in the game. For 100 Gold you obtain a 2A1W (3 path, and what paths!!!) and for 175 Gold you obtain a 3A2W1? (6 path !!! and not capitol only). Notice in many games the nation that win is Caelum (followed by any other Air Nation, usually Pythium and Vanheim, oh well expect in the games where Caelum has been Banned and not only by me).
However there will be a Copper Plate modify in 0.2 too ... raising it cost, too isy to get lightn immunity with an armor.

Thx Johan for the explaination, I thought to have written it somewhere before, about gem cost ...