Spoiler Tip,
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Go the Pirate Captain's house, bribe the door guard to enter the house.
Once inside... ... kill the Pirate Captain.
10,000 Xp.
Go to the Mage holding the Wardstone, kill him too, Xp and Book of Infinite Spells.
When flipping page to change spell, save first, just in case.
Walk to Spellhold, depending on time,
Day,
Lizardmen and Air Golems
Night,
Shadows.
Enter Spellhold.
Spoiler Tip,
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If you have Yoshimo in your party at this point of time... ... strip him. Yeah. You heard me. Strip him nekkid... ...
You will find out why later.
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If not a Sorcerer, then a Paladin.