I didn't know you couldn't go back into the pyramid after you defeated Cet! Then again, by that point I've always got a portal created at the lever, so I may have bypassed it.
As for character advancement, I find it's important to have skill goals (which you have) and advance to meet those skill goals. For example, on the spellcasting side I want to get all the *storm and artifact* spells, cure poison in vine, and heal all in spirit. Aside from that, I try to keep spellcasters in their base classes until they've mastered all their level 7 spells (since it will be a long time before they can learn them again).
For other classes, I'd change warriors to barbarian ASAP to get those HP bonuses right away.
In general, once you get to around level 14 or so, the next level you go up in that class would take you to level 8 or 9 in a new class. That's eight extra hit points, but more importantly, eight new sets of skill points. Those are priceless...
I also never use spell books (except perhaps a cure poison...). When you use them, you don't get the mana boost you do when learning a spell at level-up.
Not that that last bit means much, but it seems to flow with the topic...
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*B*
Save Early, Save Often Save Before, Save After
Two-Star General, Spelling Soldiers
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Give 'em a hug one more time. It might be the last.
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