When the mod is used with the Epic Fight Mod, being attacked by a Zombie causes the game to crash and close with the ticking entity error seen below:

The game crashed whilst ticking entity
Error: java.lang.NullPointerException: Ticking entity

Isolated to these two mods, thought I would mention it here for you.

I forgot to mention it seems to be fixed by adding a sound pack. I am not sure if this is useful information to you but thought I would open a case for you!