Custom tab itemGroup, so all mod items appear, but all potions I just added a PotionItem() with the model having a CustomPotionEffects in the json. The four redstone blocks appear with no functionality yet (will do this later).
I'm not sure where to set it's text, it's in the item model at the moment (an assumption). Do I have to sub class WrittenBookItem? Is it possible to make it readable by using a json file or does it need code to load the book content? I managed to fix 1 more error on in achievement recipes as i had a bad item name or 2.