Oh god why... :/
I'm right next to Karlito >.>
He has to make sacrifices to spread his dominion, disturb his blood hunts and you're golden. He's most likely going with a heavy bless strategy. Having
stealth sacred armies yourself, you should be able to rape his blood economy. (he's not hunting in his capital, or not going to for long, i'll tell you that much)
Especially if you took a gorgon SC pretender. Adding fear and awe together makes for a deadly combo, add stealth and nature/death magic to it, and it's a pain in the ass.
+10 Cruel Irony points if you manage to permablock his capital with rain of toads spam. Though if you don't get a lucky merc, you'll need to wait for a while for a good blood mage yourself. I don't remember the boosts for that path at all. It's not THAT useful against blood Mic's, but fun > usefulness.
You may be in trouble if he tries to knock you out before BE starts (which he probably should), but that's your own fault, if it happens!
With all of this being said, i'm sure Kar can come up with another way of harming you, but there is nothing that you cannot counter yourself. Fucking Pangea's recuperating blessable invisible armies, and all that. You are HIS worry.
/love