03 Mar 2006 at 00:46 - 2
Infusion is the process of imbuing your armor with magic that protects against Spectral Agony. An armor with this magic is said to be "infused."
Spectral Agony is a skill used by the Mursaats. Without infused armour you will not survive very long against a Murssat, probably afew seconds. Having your armour infused will reduce the damage from Spectral Agony.
To get your armor infused, you seek out a Seer and give it the Spectral Essence. This is explained when you do the "Iron Mines of Moladune" mission.
You can get your armour infused prior to this mission by seeking out the seer in Mineral Springs.
I hope that answers your question.