Did I dual class too late?
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I aimed to dual class Xzar to a cleric earlier but needed a tome. By the time I got it, he had reached level 7. That didn't seem to be as huge a problem till I saw the insane amount of experience to reach 8th level as a cleric. I'm fairly fare in the game and he's a level 4 cleric at the moment. Should I just load or will he be alright?
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http://playithardcore.com/pihwiki/index.php?title=Baldur's_Gate:_Progression_Charts
It looks like at level 7 mage Xzar would have had 60,000 xp and a level 8 cleric will need 110,000 xp for a total of 170,000 xp which is 9k over the cap so that won't work.
A level 6 mage / 8 cleric would work with 40,000 xp / 110,000 xp which would be 150,000, which is 11k under the cap.
If you have gone further than you want to load back from, you can always use shadowkeeper to change his first class to level 6 and remove the abilities / spells and HP he may have gotten from that 7th level.
However, even without shadowkeeping it, your mistake isn't the end of the world. Xzar would finish as a level 7 Cleric, pretty useful and not too far behind a pureclass Cleric who would only reach level 8. Of course his mage levels are wasted, and that's a pity, but probably not a game-wrecking disaster.
There are instructions on this forum somewhere. Search for Shadowkeeper and you should find it. I'd find it and link it but I'm literally running out the door, so if you can't get Shadowkeeper to work and you can't find the post let me know and I'll tell you how to get it running.
Of course, you'll have to copy newer saves over if you want to edit them.
(If you don't know, dialog.tlk is in 00766\lang\en_US or whatever language you use, and the rest are in your Documents\Baldur's Gate - Enhanced Edition folder.)
Scroll to the very bottom of the page. Click "Download ShadowKeeper.zip Version 2.1.4"
Follow the steps Jalily posted. Done.
With that said... having SK up and running with bg:ee is still nice to have and worth taking the time to do!