I've been looking all over, but can't seem to find any info about this.
The armor from Katta Castrum merchants has this aug slot plus a type 7. The only items they sell that are type specific are power sources, which are type 1, and I assume these go in the inventory slot, not on the armor.
So, what's 13? Player made?
"An assassin is chaos unleashed..." - Steven Erikson