Watcher's Keep Altar Level

Altar Level, aka The Ritual Level, is the 1st level of Watcher's Keep.

Guide

 * In the center of this area, you will find the portal to the 2nd level. It is inactive, however, and needs to be activated.
 * In one of the rooms on the northeast side of the area, you will find the Tinderbox and the Old Slippers.
 * In the west corner of the area, next to the altar, you will find the kitchen. Use the Tinderbox to light up the fire and the ghost of the Archivist will go to it for its warmth. He will suggest you speak to the old priest.
 * Take the two Wardstones and the key from each of the three rooms in the east corner.
 * With the key you can open the door to the priest's chamber in the north corner. The Wardstones will prevent the guardian golems from attacking you. Click on the sarcophagus a couple of times and give the Old Slippers to the priest to placate him. Click on the sarcophagus once more and you will take note of a verse from the holy book written down.
 * Take the Candle from the chest in the kitchen and the Bell from the shelf in the room next to the kitchen. Place both items on the altar in front of the big statue and four of the statues will attack you.
 * Once you have destroyed the statues, you will need to perform the ritual. Ring the bell twice, light the candle, open the book, and then ring the bell once more and the portal to the 2nd level will open. The rest of the statues will also become active and attack your party.

Altar

 * Holy Book

Sources & references

 * Baldur's Gate II section at Mike's RPG Center