05-26-2006, 08:33 AM
The necrotic crystals you get from the undeads around the the invasion place are used not only to transform the technicians, but can be brought back to the AD for a lot of repeatable quest rewards, one of them is 8 necrotic crystals for 2 sharpening stones/blessed wizard oil (+100AP/50spelldmg on undead). So, yes it is repeatable.