945 Portal Formation
The fact that their last project was going to be a portal array couldn't be a coincidence. Someone with power must have pulled strings to get Thorin to teach the formation to so many people when the Masters had been carefully keeping it secret for so long.
Wolfe did consider that it might just be difficult to make, but there were some Generals in the room, Rank Six magic users, and there weren't many spells that were going to be beyond their capabilities.
Financial capabilities aside, as Wolfe realized, looking at the diagram on the whiteboard.
The array needed no fewer than ten diamonds as large as his fist, precisely cut and without cracks, though they could have discolorations or other blemishes.
"Is there a substitute for the diamonds?" One of the class attendees asked, frowning at the astronomical cost of such an endeavour.