Zogre Flesh Eaters/Quick guide

Starting out

 * Talk to Grish in Jiggig, located a short run south of the Castle Wars.
 * Talk to the Ogre Guard.
 * Climb over the barricade.
 * Run east and down the stairs.
 * Run north-west and search the skeleton, kill the zombie and take his backpack.
 * Open the backpack, search the broken lectern.
 * Read the torn page.
 * Search the nearby coffin until you find a Black prism (may take multiple attempts).

Yannille

 * Enter the Dragon Inn pub in Yanille.
 * Use the dragon tankard on the bartender.
 * Talk to Zavistic Rarve on the 1st floor of the Wizard's guild. Ring the bell outside if you lack the requirements.
 * Enter the house north of the guild, first floor, talk to Sithik.
 * Search the drawers, the cupboard, and the wardrobe.
 * Read the 3 books, use the papyrus on Sithik, use the portrait on Sithik.
 * If Sithik didn't appreciate the "honesty" of the portrait you will have to make another.
 * Use the portrait on the bartender.
 * Show your items to Zavistic in the magic guild.
 * Use the Strange Potion on Sithik, then use it in his tea, amazingly he doesn't suspect a thing.
 * Climb down the ladder, climb up the ladder, ask Sithik all the possible questions.

Final Battle

 * Return to Grish at the quest start, he will give you a key.
 * Ask him if there is an easier way to kill Zogres.
 * Head down the stairs to the east again.
 * Once inside, run directly west, through the double doors and down more stairs.
 * Search the stand in the open area. Prepare for battle.
 * Kill Slash and take his artifact.
 * Return to Grish.
 * Quest complete!