Kind of related to my other spellthief question.
In the Steal spell description, it is mentionned "At any one time, a spellthief can possess a maximum number of stolen spells equal to his class level" and "Alternatively, a spellthief of 4th level or higher can use the stolen spell power to cast any spellthied spell that he knows of the same level or lower"
Assuming a 20th level spellthief that stole four 5th level spell for simplicity's sake, and they all are Cone of cold. If the spellthief would want to cast a 3rd level spellthief spell, say Globe of invisibility, what would happen to his "spell power reserve" ?
I can see two options :
he's left with 3 cone of cold and 2 levels of spells that can only be used to fuel his own spells
- he's left with 3 cone of cold and that's it
Which should be the correct interpretation?