Just my two cents, ive used concordance with petaniqua and nergal, (petaniqua for combat reasons though) and nergal is stupid good with such shenanigans. Base nergal can bleed, get a cog, freak drive for free, and get concordance in one turn. Then, during you preys turn, he can fow bleed for 4, and since its free, he just burns 2 blood for damage from fow and dtd. Or you can use other means of getting a fow bleed through, such as true loves face, croc tongue, elder impersonation, and or srealth or the daimoinion block fails. And if you dont get a fow, you can jusr untap with concordance and bleed as an action. Its not as abusable as madness rachel, but he doesnt have to be untapped and hes more durable in combat.
Hope ive helped add to your info.
As for dawn op, my favorite vamp is Gotsdam. He bleeds or rushes and any blocks are at dawn, and he can mind of yhe wilds or thoughts betrayed to put in crows or whatever as agg. And or bolt on tham to do weather control, or for burst of sunlight while blocking.
But nergal concordance is better for fow or dtd.
Ignore aggravated vs treat aggravated as normal
