Harbinger of Oblivion

Harbinger of Oblivion is a mission in the campaign of Legacy of the Void, and the third mission in the Ulnar storyline.

Background
""You must listen to me Matriarch. Amon's trap is sprung. Your leader is in grave danger." "You think us fools?." "Yes, but that is irrelevant."

- Alarak and Vorazun

Aboard the Spear of Adun, a protoss crewman reports to Matriarch Vorazun that there is a spike of void energies. Suddenly First Ascendant Alarak of the Tal'darim teleports aboard. The two fight, but Alarak says he's here to help them, as Artanis was trapped by Amon. Alarak stated that Amon had betrayed his people and he wanted retribution. Vorazun did not believe him, but decided that it was their only chance to rescue Artanis.

Mission
""Vorazun, your forces have arrived just in time. Amon has opened a portal to the Void. It must be shut down before it tears us apart."

- Artanis

Vorazun sent forces in the direction Alarak suggested, including a group of high templar recently recovered from the shock of their severance from the Khala. They fought their way through Moebius Corps's forces to reach Artanis and Kerrigan, who were engaged in combat. Artanis informed Vorazun that the void portal was open, and the void crystals powering it had to be destroyed. Kerrigan set up her hive clusters to bear the brunt of the void energies.

Artanis and Kerrigan pushed each of the Tal'darim and Moebius bases, destroying void crystals along the way. Karax uncovered xel'naga vessels on the platform that contained solarite, which could be used to upgrade the Spear of Adun.

When the last void crystal was shattered, the portal closed. Artanis swore this would be the first victory in their efforts to turn the tide of Amon's darkness.

Aftermath
""There is no time. My people are being consumed, their very flesh being turned into Amon's own. I cannot wait." "Then you must do what I have. Gather allies, subjugate enemies, do whatever you can to ensure victory. Survival is never pretty."

- Artanis and Kerrigan

Artanis came back to the Spear of Adun, and asked Kerrigan to join him. Kerrigan stated her broods were devastated, and it would take time to rebuild them. Artanis stated there was no time, and Kerrigan suggested gathering allies as she had.

Artanis met with Alarak, who said he expected more of the Hierarch. Fenix threatened him with violence, when Alarak revealed to him that he was only a machine. Alarak stated that Amon had broken his vow with their people, and must suffer for it. He made an offer to Artanis that he would take the Tal'darim out of the conflict if Artanis helped him evoke the rite to become Highlord.

In the solar core, Karax discovered that the Keystone could save the protoss, and that it would store energy to awaken the xel'naga on Ulnar. It would be possible to use the keystone to extract Amon from the Khala if it were modified correction.

Artanis gathered his war council. He revealed that Amon had been using protoss bodies to make his host form on Aiur. Rohana informed the council that Amon was using the Golden Armada to purify planets in across the Koprulu Sector. Though they did not have enough power to face the Golden Armada, Artanis speculated they could destroy his other forces. Fenix suggested that they reactivate the ancient purifiers,much to the ire of Rohana. Alarak stated that they had to move to Slayn to remove the Tal'darim Death Fleet and crown him as Highlord. Karax stated that Moebius Corps is also still around in force, and making the hybrid, though they did not know where they operated from. Artanis had Vorazun send her most elite dark templar to hunt for Moebius Corps's base.

Walkthrough
The first portion of the mission is a simple tutorial on how to use high templar. Storm groups of units, and feedback any units with energy, such as spectres and medics. As soon as a base is established, start building a balanced army. Stalkers/dragoons and immortals will be useful when up against siege tanks and hybrid.

Should obtaining the mastery achievement not be the goal, it is recommended that all major pushes be done with zerg support, as they provide a substantial amount of damage and soak up a lot of hits from the defenses. Unlike most maps, the bonus objective is located in doodad canisters located through the map, and will not appear on the player's minimap. However, they are out in the open and do not require too much advanced exploration.