Don you think that a Paladin with the Grail Virtue and mounted on a Pegasus shouln test Ld in order to charge a fear causing enemy?
This is an interesting question that is not completely covered by the rules. Any character with the Grail Virtue is of course immune to psychology, and does not need to test for fear nor terror. The Pegasus is however not. I’d interpret this as if the Pegasus didn’t need to check for fear since the rider would “calm it down”. Other people might see it differently. In cases like this you should agree with your opponent on a solution before the game starts.