The Spell Interface is located above the middle book (The Intelligence Skill Point book) and texture is the default weapon for your class. This can be used to change keybinds for your spells or monitor your spells. You can also get more statistics on your spells in-game rather than having to browse the wiki, it will tell you when X spell will be upgraded. It will tell you what is improved on the next level, etc. Additionally this opens more possiblities like a "Spell Point" system rather than a certain spell being upgraded at a level. You could get spell points at these levels and choose which spell to upgrade (However, you can't unlock a spell early, they unlock by themselves) That can be further expanded on if there are more than four spells added onto this, and at max level we can't have all upgraded, so spells become important elements for builds. There could be people who stick to maxing out 4 spells and a few more spell points elsewhere, or people who go full hybrid and use a myriad of different spells to be more adaptable to each situation, and there can be people who will experiment with unusual combinations and try to re-define the new meta. Spell points would make people a lot more careful with builds, and the Tower of Amnesia will instead be used to get Spell Point Resetting Books, because it's pretty useless now since we only need to invest Soul Points in the interface.