Infusion

Mursaat are nearly unkillable when you first encounter them. Their Spectral Agony attack can bring down the toughest of heroes in seconds. Fortunately, there is a method to protect you from this devastating skill: Infusion.

Infusion is the process of imbuing a piece of armor with magic that shields against Spectral Agony. An armor with this magic is said to be "infused." All armor can be infused. When a Mursaat's Spectral Agony attack strikes a piece of infused armor, the damage is greatly reduced.

To get your armor infused, you must seek out the Seer in the Iron Mines of Moladune mission. From there, you will be instructed to kill a boss called Eidolon. Once defeated, Eidolon will drop an Ancient Essence that must be carried back to the Seer. The Seer will then infuse the currently-worn armor of everyone in the party. If you keep multiple sets of armor, or if you change your armor later in the game, you must come back and infuse the new set to survive against the Mursaat.

Tips

 * 1) Don't fight on the way to the Seer. Do an "infusion run": just run past all the enemies.  Once you make it to the Seer, a cinema sequence will revive your party.  Do note that, unless you skip the sequence, any enemies still chasing you at this point will beat up your party while you watch it.
 * 2) Bring a warrior with Sprint or Charge along. They have the best chance of surviving a run to meet the Seer.
 * 3) Bring along Balanced Stance. There are giants along the way that like to knock people down.
 * 4) Infuse every piece of armor you want to wear!

Other infusion locations
There is a seer in the north-easternmost section of Mineral Springs that will infuse your armor.

There is a seer in the Ring of Fire that will infuse your armor.