If you use Spell Engine and its dependencies alone on a new modpack its fine if you add any of your other mods like wizards, archers, paladins and rogues with it it will crash, it also crashes when used with Fichtee's mods and the mod Cleanrooster's Arsenal and Classes.

Reverting back to 1.4.5 allows all of these mods to work.

Please provide a crashlog to make this actionable.

Clean slate modpack with spell engine dependencies and wizards rpg series mod crash log gist

Is this the right log?

Content mods need to be updated.