What is in the Dungeon?

Hint 1 of 6:

A key!

Hint 2 of 6:

You have to get past the force-field.

Hint 3 of 6:

Use the Blue gem on the Amulet to get rid of the force-field.

Hint 4 of 6:

Need a map?

Hint 5 of 6:

From the force field, walk 1 room North and 1 West.

Hint 6 of 6:

Look carefully at the floor.