Just reading about might, on Page 65 it says that using might you can adjust a single dice score up or down! When and why would you ever adjust a dice roll down? Does that mean I could adjust the dice roll of my opponent down using might? If so, I never knew that.

You cannot adjust your opponent's might at all. There are instances in which you may want to lower a score with might eg lowering the number of casualties caused by casting SfC on your own troops.

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"I am the Flying Spagetti Monster. Thou shall have no other monsters before me"
-FSM.

Aha why thank you Gothmog