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Lair of the Devourer

1 - HEAD GAOLER ALAEFIN... OR IS IT?

You'll finally get to deal with the Head Gaoler in what's called the "Lair of the Devourer". Alaefin will be aggressive as soon as you enter the room, but the other guards will just stand around. However once you do manage to defeat the Gaoler (who is moderately difficult), you will reveal the reason for his seemingly insane actions. One of the Waterdhavian creatures, an Intellect Devourer, has taken control of him.

When you initially defeat Alaefin, the Devourer will be free and will quickly possess one of the nearby guards. It will continue doing this until you have defeated all of the possible hosts, after which you'll be able to do battle against the Devourer itself. It turns out to be a lengthy and difficult fight, but nothing you can't handle with the appropriate tactics.

There is an easier way, however. Once you enter the Lair, ignore Head Gaoler as long as you can until you talk to all of the guards and persuade them to flee the place. Once all the guards are freed you can focus on the Gaoler.

Once you are victorious, be sure to loot the Devourer Brain so that you can return it to Lady Aribeth for the plague cure. In addition to the brain, grab any items the Gaoler dropped and loot the chests that the room contains.