Trojans are described by the wiki as knights that have been lost to the clockworks, which turn into the giant knight that a Trojan is. All Trojans have that crystal in their back, which is their weak point. (Possibly their power source?) Arkus is an example of this too.
Now, we carry back minerals from the clockworks. These minerals somewhat resemble crystal formations. We carry these on our backs and bring them back to be dispensed into the gates. Could it be that these crystals are somehow related to Trojans? Possibly corrupted by the crystal?
STOP CARRYING CRYSTALS!!!!