There are no special dungeons for Vampire Lord or Loki, especially the later is a god that can only be obtained from the rare gacha.
Your second question, +99 to each stat, so +297 maximum, but hella expensive :3
And for your team, I think it's better if you evolve that Moonlight Dragon for the Dark 2x ability(if you can't get your Vampire Lord anytime soon), then get a friend with Dark 2x ability too, your team would be decent then.
I have a Vampire Lord as my leader most of the time, if you need him, you can add me. (you can even send a mail to me if I wasn't using it, and I could switch for you)
My ID: 334,437,281
It wasn't 5 hours, it was previous 8 hours plus that, so 13 hours total XD
Last edited by Blizt; 11-21-2012 at 02:39 PM.