Invocation

On the very bottom level of Gehennom, there is a square that vibrates when you stand on it. Make sure you have all of the Invocation Artifacts, and that they are all uncursed or blessed (it's alright if the candles for the Candelabrum are cursed, though). Take a deep breath, and then...

1. Install the seven candles in the Candelabrum
2. Light the candles
3. Ring the Bell of Opening
4. Read the Book of the Dead

In`vo*ca"tion (?), n. [F. invocation, L. invocatio.]

1.

The act or form of calling for the assistance or presence of some superior being; earnest and solemn entreaty; esp., prayer offered to a divine being.

Sweet invocation of a child; most pretty and pathetical! Shak.

The whole poem is a prayer to Fortune, and the invocation is divided between the two deities. Addison.

2. Law

A call or summons; especially, a judicial call, demand, or order; as, the invocation of papers or evidence into court.

© Webster 1913.