Minor spoiler
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One of the kobolds worshiping the crystal has stakes on him.
(can't remember if it was a captain or shaman or something like that though)
That stake can be really hard to miss... Try examining all those loot piles that the Kobolds dropped.
[url="http://www.sorcerers.net/Games/BG2/SpellsReference/Main.htm"]Baldur's Gate 2 Spells Reference[/url]: Strategy, tips, tricks, bugs, cheese and corrections to the manual.