This has happened every time I start Forge, I've googled it and tried to remove some of the mods I thought would be causing it, I've done some research, and even after all that it still says that it wont start because there was a problem loading the description of the mods? The client launches but not like 30 seconds in and it starts to not respond and crashes, leaving me only the crash summary and the log. I tried to fix the problem myself by deleting the mod that "caused the crash" but it just finds another mod to crash on yet again. Here is the summary of the crash that the launcher gave me 

 

The game crashed whilst rendering overlay
Error: java.lang.IllegalStateException: Failed to load description for particle mutantbeasts:endersoul
Exit Code: -1

Log is here

Thanks for the help, I deleted the KV mod and huzzah, minecraft finally started working again. Thanks again for your help!