ToME: the Tales of Maj'Eyal

I was Scintillating Caverns and used Digest on a Prismatic Crystal and was given the 'Summon' ability. Upon using 'Summon', it did not summon three of those exploding light wisps as I expected, but rather a Bandit lord instead. The Bandit lord then used its summon skill and all of the summoned rogue-type mobs were hostile to both me and the Bandit lord. This is easily reproducible, but does not emit any error in the log.