You can get red dice on move and on attack. Look at the stats for the leg armor (for moves) and weapons (for attack) to see how frequently you can get the red die roll. Most are between 25-50% chance, and It sure feels like the 50% items trigger about half the time. The only one that feels like it doesn’t is Farideh’s lifedrain sickle, but probably because I always want it to trigger more often than it does.