Think I'm finished with level 7.
Added the class features for 1st level Elemental Savant (basically just 5 resistance to lightning), increased Will save by 2 for 1st level Elemental Savant, added Identify, Dimension Hop, and Energy Aegis to spell list, and 1 more spell slot for each of levels 1, 2 and 3.
Added staff to inventory, but it hasn't yet been identified.
Added stats for Shazi.
I don't remember how you wanted to handle hit points for a new level...you roll, I roll, or a flat number.
Does this shop we're in have any components for Identify? I expect it'd be a fairly commonly cast spell, but it wasn't listed (and is expensive) so I don't want to take it for granted.