Later this day I will release a new feature.
Yes, spell slots are finally here. Nothing fancy and nothing that looks what class or level you are.
In general there is 9 slots, I added one more if you have any house rules or I've missed some feature or so. And yes, the normal spellcaster can have 4 spells in the first spells slot, but here you can toggle between 0 - 10.
Many users asked for this feature and I hope you will like it.