Dice

Power Dice
Power dice are normally added to rolls because of hero traits or abilities. A hero can also add power dice to an attack by spending fatigue (see “Spending Fatigue for Attacks,”). However, an attack may never have more than five power dice added to it, no matter the source.

Re-rolls
There are two main effects that cause dice re-rolls in Descent: Journeys in the Dark. These are dodges and aimed attacks. The player causing the re-roll chooses one or more of the dice involved in the attack, and then the attacker rolls those dice again, keeping the new result. Under no circumstances may a single attack ever be re-rolled more than once. If an attack is affected by both a dodge and an aimed attack, then the two effects cancel each other and the attack is not re-rolled at all.