Unspeakable, Unknowable

Overview
Summary
 * 1) Return to the ancient ruins of the Great Destroyer.
 * 2) Destroy Hierophant Morlog before he learns the true name of the Great Destroyer.
 * 3) Return the Tome of Rubicon to the ancient ruins. Drop it where High Priest Alkar awaits.
 * 4) Collect 4 shards of Balthazate crystal and place them near High Priest Alkar. Be sure to protect the High Priest from enemy patrols.
 * 5) See High Priest Alkar for your reward.

Obtained from
 * High Priest Alkar in Sorrow's Furnace.

Requirements
 * You must first lead High Priest Alkar to Sorrow's Furnace as part of To Sorrow's Furnace.

Reward
 * 8,000 XP

Dialogue
 * "The Stone Summit are dangerously close to uncovering the Tome of the Rubicon. Inside is the true name of the Great Destroyer, the bane of the living and nemesis of the Great Dwarf himself.  If the seals that bind that book are dispelled and the true name spoken... well, let's just say there is no worse thing that could happen in this world.


 * I could use yer help gaining entry to Sorrow's Furnace and stopping the Summit from getting their hands on the Tome. Will you help me?"

Followup:
 * None

Walkthrough
Warning: High Priest Alkar must survive! If he dies, the mission fails and the whole party is sent back to the Deldrimor War Camp.

Note: Currently the game has a glitch whereby the Priest occassionally starts healing enemy units. While annoying at times, it is not a serious concern.

Follow Alkar through the Furnace and watch not to lure too many groups at once. He will turn right then head down a flight of stairs and stop at the base of the stairs. He will ask that you stop Hierophant Morlog from reading the true name of the Great Destroyer. You must be ready quickly because if you are not he will rush into a swarm of Summit Taskmasters (mesmers) by himself and get killed!

Note: While attacking a group of 9 mesmers can be intimidating, the safest way to do this is to keep your healers in the back such that you are in their range but they are not in the aggro circle of the Taskmasters. Also, try and lure a few of them while he is talking to make them less intimidating.

After defeating Morlog, Alkar will return to the base of the stairs. You should pick up the Tome of Rubicon that drops from Morlog and drop it on the square area where Alkar is standing. Alkar will now ask your party to go fetch him four Balthazate crystals so that he can destroy the ruins on top of the Tome. He will also ask that a few remain to guard him. One group will need to stay and defend him, while the other group will need to find and bring back the crystals to complete the quest. For this reason, it is very difficult to finish this quest with only henchmen.

Each crystal is in the hands of a group of Dredge. Specifically, they are in the hands of the Dredge Blastrock (a boss-like mesmer). Slaying him right away will not be easy. It is important to take out the Dredge Spirit Keepers first as they are healers and revivers. It's also important to notice that sometimes the Blastrock (and other Spirit units) can revive the Keeper with Resurrection Signet!

The key to completing this quest successfully is recognizing the pattern of patrols. Let us assume the party is divided into two groups, a Priest Group of two and a Crystal group comprised of six:
 * The first time the Crystal Group assaults enemies on its way to fetch a crystal shard, enemies will attack the Priest. They will be three enemies exactly, an Enslaved Ettin, a Priest of Sorrows and a Summit Dark Binder. This small group cannot take out the Priest even if no one was with him. So, the Priest Group should be able to take care of them.
 * As soon as a Blastrock is slain, a larger group (containing three Summit Deep Knights) will spawn and head for the Priest. These are devastating as they knockdown the Priest so he cannot heal himself. It is imperative that the Crystal Group rush back to the Priest as soon as they have a shard. The best thing to do is to have a warrior grab the shard and sprint (or "Charge!") back to the Priest Group. As soon as the shard-bearer enters the aggro circle of the monsters, they will completely forget about the Priest and target him/her. All the crystal shards are within range of sprinting back to the Priest before his defenders are overrun.

Tip: Defending Alkar can be accomplished with a single well-prepared warrior. Alkar will provide ample healing as long as the warrior stays in range. The warrior can help by bringing a few defensive stances and an AoE spell from his secondary profession. A ranger specced into Traps is an even better choice for staying with the priest. Only the group spawning after the death of the very last crystal Blastrock will pose any troubles.