This one takes place completely within the library on the first floor. We get the opportunity to do a little summoning for some loot and experience. The directions for this are in the codex in game too, at least for the first 3 summoning fires. The fourth summoning fire is a secret, which I’ll share at the end.
For all of these, remember that you can hold down TAB to spot the items with which you can interact.
The first summoning isn’t too tough. You need to touch the summoning font and then walk over to the right side of the room and touch the Tome of Spirit Passages. It’s on the bookshelf near the entrance. Then you can touch the first Summoning Fire. This will bring up a type of fade hog. It will die, but you can check the body for a piece of garnet.
The second summoning is a little trickier. Touch the summoning font, then touch the Rodercoms book, the statue, and finally the second summoning flame. This will summon a trickster whim. We'll have to deal with him a little bit later.
The third summoning is harder and will actually involve a fight. Touch the summoning font, then Elvorn's Bestiary, then move over to the big table by the entrance to touch the carving spot, then the Spiritorum Etherialis, then the statue, and then the Novice Phylactery by the statue. Once you're done, touch the third summoning flame. This will summon a bereskarn. This is a type of darkspawn bear mixed with a hedgehog. It shouldn't be too tough if you have Wynne as a healer. Just have a warrior buff it while the rogue and another warrior or mage do some damage. Check the body for a pair of Charged Mitts. These are pretty nice for a mage who likes lightning spells.
The fourth and final secret summoning is just for a codex entry. If you looked around, you should have seen a fourth summoning flame by the staircase up to the second level. To use it, we'll have to run around and basically touch everything. I think you were supposed to use trial and error for this, but I've got the correct order.
Touch the summoning font, then the Tome of Spirit Passages, then Rodercoms, then the statue, then Elvorn's Bestiary, then the carving spot, the Spiritorum Etherialis, touch the statue again, then touch the phylactery. Switch to a rogue character and approach the summoning the fourth flame. Save and then touch the flame. A mage called Arl Foreshadow will be summoned up for a few seconds before he teleports back himself. Have your rogue walk forward and use stealing on him. If it succeeds, you will automatically get Codex 231, "The Notes of Arl Foreshadow." It's just a humorous little list and it shouldn't be too hard to steal. Just reload if it fails.
That officially completes Summoning Sciences.