Blackrock prism

Two kinds of Prisms exist:


 * The one kind are found in Ultima VII inside the three generators of the Guardian and are needed to get access to the Black Gate. Of the three, the Cube is the most important, because with it the Avatar was able to force the higher-ups of the Fellowship to tell him/her the truth.


 * The other kind are found in Ultima VII Part Two, and are Soul Prisms.