There is a sick troll guarding the other cell.
How to get past it?
He is done, now
It is a letter
It is changed now
There is not much you can do until you get past the Big Troll.
So, did you check the mailbox?
It is a notice of termination. The small troll guarding your cell is released from his position.
Say, could you use that same letter to fool the sick troll to leave his position, too?
But the letter is targeted towards the small troll. You would have to forge the letter somehow.
With a pencil. The Admin Troll surely isn't helping with that. ( Give the notice of termination to Wilfred. )
Give the notice of termination to Wilfred.
Then, take it into execution.
Show it to the Admin Troll. The sick troll is now gone and you can enter the cell.