When I used the link on the Adventurer e-mail, I was able to go into the level “Deadly Discs” without using the hero Arryn Stonewall.
I was also able to beat this level with Anya by pushing the ogre out of the way, then waking it up and killing it before it could get to the peasant.
That can also easily be done by using the link itself (if you’ve not played it yet) and click the Hero-Selection Screen away. This way you will use the last hero and the last equipment you used.
Making the peasant invisible (with the ring) and then attacking the ogre also works. Sadly you cannot command the peasant away with a Gold Star…