In the Grimskull Hall encounter in The Usurper dungeon, the opponent used its champion power, giving all of its troops the Minor Ruby of Flames power (unblockable except by same shard and/or artifacts). When I tried to block one of them with my Adaptatron, however, I was unable to do so. Interestingly, when my opponent played a Grim Skull Sorcerer that was socketed with the actual Minor Ruby of Flames, my Adaptatron was properly able to block it, even though it also had the charge-power-granted text that was preventing me from blocking the other troops.