Infusion

Mursaat can really lay the smack down on you, can't they? Fortunately for you, there is a method to protect you from their wicked ways. It's called "Infusion".

Each piece of your armor can be infused. It's recommended that you infuse each piece of armor prior to engaging Mursaat. 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 Eidolon. Once defeated, Eidolon will drop an item called "Ancient Essence". One player must carry this back to the Seer, and then each person in your party can have one piece of armor infused. Rinse and repeat for each piece of armor, and you'll be "fully infused"!

Tips

 * 1) Don't fight on the way to the Seer. Do an "infusion run".  Just run past all the mobs.  Once you make it to the Seer, your party will be alive and ready to take on Eidolon.
 * 2) Bring a Warrior with Sprint/Charge along. He's going to be the one most likely to complete the run to the Seer.
 * 3) Bring along Balanced Stance. There are giants along the way that like to knock people down.
 * 4) Infuse your chest first, then legs, then the other armor pieces. Infuse every piece of armor!

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.