Forbidden Weapon

Forbidden Weapon is a mission in the campaign of Legacy of the Void, and the first mission in the Purifier storyline. Unlike the other two story arcs, it is a single mission that has a storyline continued later in the campaign.

Background
""Within the Glacius facility, the Purifier program has been reborn. We must recover this immensely powerful technology."

- Artanis

In his time as Hierarch, Artanis was made aware of a program by the Khalai Caste to create new Purifiers upon the world of Glacius. Artanis sought this technology to turn the tide against Amon's forces, but when he arrived there he found the Tal'darim Death Fleet already in orbit attacking the facility.

Mission
As the Daelaam forces arrived on the planet, they were greeted by First Ascendant Alarak, who stated they were too late and the facility would be destroyed. His Tal'darim mothership unleashed its displacement beam and began to destroy the facility's defenses, advancing on the technology vault.

Phasesmith Karax activated the facility's defensive sentries, and added them into the Spear of Adun's warp matrix. Daelaam forces quickly engaged the Tal'darim, staying ahead of the mothership's beam. Several caches of raw solarite were uncovered in the facility, left behind by the scientists there.

Artanis's forces reached the vault and deactivated its shields just in time, allowing the Spear of Adun to warp aboard the container holding the data on the Purifier program. Karax discovered a prototype warrior within the container.

Aftermath
""Artanis! It is good to see you young executor!"

- Prototype Purifier with the memories of Fenix

Aboard the Spear of Adun, Phasesmith Karax discovered that the prototype Purifier was a robotic construct with the encoded memories of Praetor Fenix. It was not aware it was a Purifier or that the real Fenix had died, and its last memories were of Judicator Aldaris ordering him to Glacius and putting him in stasis. Artanis, though relieved to see his old friend again, was not entirely sure if it was truly Fenix, and noted he served as a melancholy reminder of his death.

Walkthrough
The player spawns on the southeast corner of the map, and must race against the Tal'darim's displacement beam to get to the technology vault. A balanced force of stalkers and zealots can break through most defenses, as long as there is a strong economy supporting the force. As the mission goes on, force field barriers can be destroyed to allow quicker reinforcement, or pylons can be warped in close to the frontline to allow for quick warp ins.

When engaging Tal'darim bases, try to bait out forces from behind their static defenses before engaging, and engage only portions of their defense at a time. Though the bonus objectives are not that well defended, they can be hard to find in the time allotted, so it may be worth it to save before the final attack on the vault, scout the map, and reload once it is known where the solarite is.

The final objective only requires the destruction of the pylons next to the technology vault, so if running out of time the player can dive in forces to destroy them and still win the mission.