Keep it as a trump card, use it when necessary.
As for the exact price...
Let's just say, under normal circumstances, the "Ruby Dust" needed for the casting materials of a [Force Field Prison] alone is worth 1500 gold.
And once inscribed into a Magic Scroll... well, even a man as wealthy as Cornell felt it was a bleeding of his heart.
The cost completely outweighs the mission rewards.
Even the greatest gain of this adventure, that silver-white apparatus of obvious significance, broke free from the [Force Field Prison] and was teleported away.
"It's almost drained me dry."
Cornell's gaze swept over the goblin corpses around him.
Not to mention their ears, which were scorched down to mere charred black, and whether they could still be traded for a bounty as spoils of war.
This sum of money, he didn't even care for.
He stepped forward and ascended the steps in the center of the cave.
The last ring on the thumb of his left hand flickered with a silver light.
