Mordenkainen

AKA Mad Mage of Mount Bartok, an Auror

Prepare Spells

You should definitely make notes on a few spells you want him to use - Time stop? Cone of cold? A lightning bolt cast at an 8th level slot? And definitely counterspell. Read up on them, maybe write down what they do and a page number in advance. [1]

Mansion: The magnificent mansion is on PH page 261.

Reward

If the heroes help him shake off his nuttiness, he gives them each a Charm of Heroism: It gives the effect of a Potion of Heroism.

• +d4 to attack rolls and saving throws for one minute (10 rounds). * 10 temporary hit points for one hour. [2]