When I looked into the crashlog Ex-Astris was looking for the Blizz that was updated in the recent CoFH Thermal Foundation updates.
Please can you fix this so I can get back to my favourite modpacks.
Here is a Pastebin of thecrash.: http://pastebin.com/BczWrDc3

Fixed in 771db2d

Please use the following builds:
Ex Nihilo: http://ci.tterrag.com/job/Ex-Nihilo/
Ex Astris: http://ci.tterrag.com/job/Ex-Astris/