Hey, I maintain a few Custom Packs. I'll take a look at your pack and see if I can fix it for you.
**Edit**There, All fixed. You had a few mods that were incompatible and a few mods that were out of date. I updated the ones I could however I had to remove Equivalent Exchange, Custom LAN Mod, Rei's Minimap
and PowerCrystalsCore because they were causing problems. Heres the link to the working modpack: https://dl.dropboxusercontent.com/u/110225014/modpacks/Mystical%20Creature%20Craft.zip
Your Welcome.