Here's my take on the Krielstone Bearer and Stone scribes. Next to the Dire troll Mauler, this is one of the most iconic units for trolls. You see them in lists everywhere and deservedly so. They give your army a +2 armor bump and with the UA can give it either +1 STR, make it immune to continuous effects, or remove stealth and incorporeal. The real downside is that your caster has to power the stone with fury and with some, that's pretty difficult to do. Madrak, for instance, is only a FURY 5 and it makes it really hard for him to do what he needs to do and power the stone. It's still taken in his lists, just hard to do. I don't take one in my Gunnbjorn lists, I just can't fit one in and don't really need it that much in his list.
