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The Wizard unleashes the Ancient Rite:
The Sorrow That Throws The Mountain
(this spell is expended, and Silence can never be used again)
QM: All magic has a price, a consequence.
As you may have gathered, on an ordinary roll success, 7-9, you will unleash merely some coincidental mundane effect, akin to petty or hedge magic, that may or may not be exactly what you wish.
On a roll of 10 or greater, you will unleash a unique named spell, an Ancient Rite, that will give you the effect you want and potentially another added benefit.
The Ancient Rite once invoked can NEVER be used again.
Use magic carefully and sparingly, for failure and mishap can invite dark and severe consequences...
(QM: the Thorn Fiends are effectively stunned. Any hero with any melee weapon can deliver a coup-de-grace killing them instantly without any roll required. Assign your actions carefully...)