Multiclass spell slots are a nifty mechanic found in many role-playing games. They allow you to cast spells from multiple classes simultaneously, without having to change your spellcasting mode.
When multiclassing, your spell slots are divided evenly between your classes. For example, if you are a wizard and a fighter, you would have three spell slots available: one for each class.
If you wanted to cast a wizard spell, you would click on the wizard icon in the spellbook and choose the appropriate spell from the list. If you wanted to cast a fighter spell, you would click on the fighter icon in the spellbook and choose the appropriate spell from the list.
The multiclass system is a great way to customize your character’s abilities and make them more versatile. It also makes it easier to switch between classes during battle, since you don’t have to relearn all of your spells.