Not a problem. No rule says you can't and they even use a 10th level (modified) spell as one of the examples.KarinsDad said:I do not have my books in front of me, but I do not think you are allowed to make a 5th level spell persistent since it would be the equivalent of an 11th level spell.
The Spellcraft DC is 51 for a 5 level spell Is it possible ?