Baldur's Gate: Siege of Dragonspear Walkthrough by Enilwyn/Repository of Undeath

Entrance
Lich Outpost, 3000 xp upon entering. The white, “Pillar Riddle” marker should read, “Failed Phylactery.”

Upon entering the repository we discover a small library with books strewn everywhere. Browsing the selection of tomes we notice four particular passages of interest. Liches…we wouldn’t be wrong to turn back now and tell Brother Deepvein that Gurn Coldhearth’s remains are beyond our reach. However, our sense of adventure and the ability to reload at will always take us at least one step further…
 * Tome of Ancient Knowledge
 * Volume MXCII of the History of the Netherese Empire
 * A Philosophical Treatise on the Nature of Lichdom
 * Mortal to Lich Notes

Raised Pool
Find the scrying pool’s three missing Silver Scepters and place them in their holders by interacting with the pool (arrowed-circle icon). The raised pool clears and allows us to choose one of three visions (3000 xp). Choose a vision (500 quest xp / each) The Essence of Clarity   allows us to view one additional vision. By searching the repository, we can find two more vials. Guarding the laboratory is a Bronze Sentry carrying the Sword of Troll Decapitation +1.
 * Room south of scrying pool, on table
 * Sarcophagus room
 * Laboratory, on table
 * A remote view of Imoen
 * A remote view of Caelar Argent
 * A remote view of the Hooded Man
 * Sarcophagus room, loot from undead
 * Same room containing  The Uncursed Staff +1
 * Laboratory, trapped shelf

Laboratory *Dwarves of Dumathoin*
Step 4:

In the laboratory Cleric’s Vestments and a Chest Key can be found, once belonging to Gurn Coldhearth. The key unlocks the chest at the dwarves abandoned camp in the dwarven dig site. Inside the chest are Coldhearth’s journals and letters which reveal the insidious plot that brought the dwarves to this dig site. Speak with Deepvein (The Secret Revealed). Also in the laboratory is a throne. Pulling its lever unlocks the door to the area west of the sarcophagus room. It appears this is an old collapse entrance and the reason the dwarves needed to locate another entry point. With the Chest Key in our possession, we can revisit the abandoned dwarven campsite and unlock Gurn Coldhearth’s chest. We discover a parchment and Coldhearth’s journal. He alludes to a sickness ravaging his body. Could this be why he’s in such a hurry to become undead? With parchment and journal in hand, we can report back to Brother Deepvein. He will expect proof of our claim that Gurn Coldhearh used his friends to make a clandestine deal into lichdom. If we refuse he will turn hostile to obtain the evidence. If we saved Semahl, he will vouch for us and tell about dark things Coldhearth was doing when he thought no one looking.

If we pick a dialogue option besides, “I’ll ask him when I see him” we will have three choices. Deepvein will ask us to face Coldhearth and put an end to him. He will give us The Secret Revealed. This is a quick slot item with three charges and our only prayer at defeating the lich. Should we run out of charges, Deepvein can restore them.
 * Agree to help the dwarves
 * Request a 500 gold payment
 * Refuse to aide them

''Editor’s note: Although this item will work on any undead, make sure you have at least one charge left after this quest. It will come in handy later.''

Pillar Riddle *Dwarves of Dumathoin*
Step 5:

Activate in the following order. Selecting the pillars in the incorrect order will spawn monsters. The door near the pillars will now be accessible.
 * Winter (Snowflake)
 * Autumn (Cracked and fragmenting leaf)
 * Summer (Shining sun)
 * Spring (Leaf)

Destroy the Phylactery
Step 6:

Take the Ancient Key from Coldhearth’s body and open the false wall. His phylactery is the second one in from the left. Upon interacting with the correct phylactery we get our clue on how to destroy it.

''Though seemingly composed of malleable precious metals, this phylactery resists all efforts to damage it. Destroying it may require power beyond the Prime Material Plane.'' With Lich Coldhearth’s soul still intact inside the phylactery, it won’t be long before he is hot on our heels again. Take the phylactery to the Fire Plane portal on the western side of the dungeon to destroy Coldhearth for good. ''An image of a fiery landscape appears, accompanied by a blast of unearthly heat. You realize that it was in such a place as this that the Coldhearth lich’s phylactery was formed.''

''You cast the golden box down into the flames. As it falls, the metal turns molten, it’s surface bubbling and sloughing off. The soul within screams in rage and fear as the fire consumes it.'' Return to the dwarven clerics once Lich Coldhearth has been dispatched. (Helm of Dumathoin). At this point, we can ask the clerics to aid us in our quest against the Argent Crusade. Brother Deepvein stiffed me when previously I asked for 500 gold to do the deed. However, he did give me a scroll.
 * Reward: Emerald, King’s Tears, 3000 quest xp, 3000 xp & 22000 xp

Gurn Coldhearth’s Offer
If we tell the lich we came seeking power and wealth he will strike a deal with us. We can choose to help the lich and retrieve the five “Keeper of Secrets” amulets the clerics wear, all located in various parts of the first level. For this,  Coldhearth promises an item of great value. If we return with fewer than five amulets he will turn hostile. ''Editors note: the dialogue states we receive the weapon, but it never shows up in our inventory after the conversation. I believe the reward is one or the other (Hammer vs. assistance against the crusade).''
 * Demand the item (Dread Hammer +2)
 * Be slightly more polite and Coldhearth will agree to aid us in the fight against the Argent Crusade

Navigation
&lt;&lt; Interlude | Chapter 7 | Chapter 8 | Chapter 9 | Chapter 10 | Chapter 11 | Chapter 12 | Chapter 13