I was thinking, can duinhirs roll of D3 wds on a monster be adjusted by might?

I'm asking because in the main rulebook it states that might can't be used to adjust random rolls such as whether an arrow hits the mount or rider etc.

It isn't a 50:50 random roll, so I would be inclined to think that he can.

Me too.

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"There are few left in Middle Earth like Aragorn, son of Arathorn." - Gandalf, Many Meetings

Again, it is because of Duinhir that the roll is being made and so I think it is completely reasonable to use might on those rolls. The way I see it is if the roll is being made because of the hero then that usually sorts it out (unless the rules state otherwise).

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"War does not determine who is right, only who is left."
- Bertrand Russel