You remove the item from the satchel and the two guards scrutinize it. Then they nod their approval and draw back their spears. At once the crackling crimson energy ceases to arc between the shafts.
‘You may pass,’ they say, without any trace of emotion, and as they stand aside, so the two great doors glide silently open. Steeling yourself, you stride towards the blazing purple light which fills the chamber.