Quasqueton said:
Many folks here answered the question in the way it was asked. But some seemed confused.
Notice that the question was "What does the immensely powerful being do?" Not, "What does the DM do?"
And some of you guys, well, I'd hate to be your DM. You sound like you consider everything a DM does with an eye toward dumping him.
"That's a cliched plot. You're fired."
"That's a railroad setup. You're fired."
"That's an annoying NPC. You're fired."
"We're meeting for the first game session in a tavern. You're fired."
"We've stumbled into a plot where an immensely powerful being is issueing us orders. I don't like to be ordered around. You're fired."
Quasqueton
Well the question as asked is unanswerable. The correct response is "Who is the IPB, and why is he issuing orders?" Then maybe we can offer relevant advice.
He can:
A)Threaten the PCs.
B)Threaten something the PCs value.
C)Threaten something they don't value by mistake.
D)Attempt to bribe them.
E)Try to flatter/charm/con them.
F)Try to convince them they should do it for (Whatever motivates the party) reasons.
G)Kill them.
H)Harm them.
I)Nothing
J)Find other to do his bidding.
K)Do it himself
L)Ask the PC to do something else.
M)Find a changeling hooker.
As to needing a new character, I don't ever go into a campaign without asking the GM what kind of character is suitable. If he wants me to make a character who is swayable by threats, I will. If not... Well then clearly I needed a character more suited to his style of campaign anyway.
The one time I did look a godling straight in the eye and tell him no, the GM chose option F and the godling talked my character around his ethical block. It was a great session.
But in the generic scenario provided it is a serious error for the IPB to assume that a group of Heros are going to do what he asks just because he has a hairy chest.