Ok as you know Trolls are nasty critters in the game. Once time as an overlord I almost did a TPK on the PC's who were together and I threw a bash attack with Aim and suceeded doing like 20 damage with pierce 4 on all of them (for rolling four surges and with Sweep and Reach), killing three of them on the spot and one only surviving because he had Stealth active.
But when a Troll goes into the Silver and Gold range and use a Bash Attack, what sort of dice do they roll? Do they continue to roll black or do they roll silver and/or gold dice according to their color? There is no clarification either way for this. Sure the Bash rule says "Black Dice", but most monsters get silver/gold dice as they advance. Why not a Troll?