Did you do the Catacombs stacks? You've got to at least do the 3 easiest ones (I know, they can sometimes be really hard, but you've got Frost Grasp so that makes them easier) to guarantee that you get level 5 after taking the Dwarven Shelter stack out or at the very most the Dwarven and Human stacks. The Human stack is very easy with Kamikaze, I'm telling you. See if fighting them will push you over.
For the Elves, you've got to do your best to position your Vamps so they are not one shotted, but if they are it is okay, because in Bat form you can regrow your numbers - don't forget that!
Also, positioning of your Vamps with both the Human and Elven stacks at the start of the fight is everything so experiment with positioning to maximize their regeneration in Vamp form and giving you the opportunity to transform to Bat to then escape. Don't forget, also, that once you transform you automatically heal to full health, so waiting for everyone to move and then transforming is often the difference between living and dying.
Losing 1 Vamp is no biggie in any of the fights, as you can regrow them towards the end of the fight back to their original numbers so don't worry if you lose 1. Transform back to Vamp if that last Bat looks like it is going to die, to get the full heal, and to heal for easy addition of Bat #2 when regrowing!
I'll be trying this game later and we'll see if I can do it - I know you can, just keep trying!
***EDIT***
Okay, I see what you're up against - 108 Fairies and 9 Elves, oof! You only got 4 Werewolves in one stack, but I'd rather have 11 and 1 less Elf, but this is what we got to deal with. I say you have to be level 5 to do this one, but there is a wrinkle since the Fairies can dispel your Kamikaze! I just went ahead to see what you had to deal with, but I can see needing to get as much exp as possible to be level 5. I didn't check the Human stack out, but I don't think it'll be a problem compared to the Elves, so do the Elves last. You will lose 1 Vamp because the min damage is 9x8 = 72 (you might get very lucky and not lose one, but I wouldn't count on it). So you'll have to make it up at the end of the fight.
Feel free to switch to the other Kamikaze save because I can see that this one is probably going to be exceedingly hard. I'll still give this one an honest effort, though later...
/C\/C\