Pretender Magic/Bless

[Arker]

I must be blind, because this information has to be out there, but I've searched the forum and a bunch of fan sites and not been able to find it. What effects, exactly, do your magic choices have on your bless effects? I've gathered that, for instance, a certain level of water magic on the pretender will get blessed units increased defense, fire for offense, nature makes berserkers, and so on, but what level exactly do you need for which effect?