Description:

So Many Enchantments apparently crashes with AbyssalCraft and it's Integration addon.
Something that could help is
at net.minecraft.item.ItemStack.toString(Unknown Source)
It doesn't look like an ID conflict to me and in the logs it says
[19:00:30] [Client thread/ERROR] [FML]: Caught exception from acintegration

Crash report / Latest log file for when the issue was present:

Logs
Crash logs if the logs are messy

Affected versions:

• Minecraft: 1.7.10
• Forge: 10.13.4.1614
• AbyssalCraft: 1.7.10-19.1.3-FINAL
• Integration: 1.7.10-1.4.7

Duplicate of #14, read my reply there for more info.