Known Spells
PCs can learn Spells with a Spell Level less than or equal to their Max Spell Level.
PCs can only learn Spells from one of their Learned Domains.
Max Known Spells
A PC's max number of known spells is equal to their Mental Defense + Intelligence.
You may treat negative values here as 0
Spell Learning
When a PC Levels Up, they can learn any number of new Spells that share one of their Learned Domains so long as they do not exceed their Max Known Spells.
Alternatively, a PC can use spell book or scroll to learn new Spells.
Replacing Spells
A PC may replace any of their Known Spells with new Spells when they Level Up.