Communion and path boosting

[dmentd]

Actually, I tried using these items and it did not work. I put a master matrix (or whatever it is called) on an Arco Astrologer. I gave slaves matrices to two commanders. The Astrologer's magic stats did not go up. I checked during battle.

I then tried the same thing using two more astrologers with the slaves. No boost.

What am I doing wrong? I ask because I really wanted to use these magic items in this game. I was going to experiment with it this time around.