Ple-Sen
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In theory, we can buy a book and have either Goran, Kataviana, or Relhiras read it. The first will learn slowing shots and reduce the speed of the Jirovik to a crawl. The second will learn instant-kill magic and buff Goran with it (good accuracy and lots of attacks). The third will learn demonic strikes and obliterate the boss. Or, as an alternative, we can give the book to Min. Then, we'll give potions to both Relhiras and Kataviana. But that's risky, and we won't be able to buff Goran much.