As Peter2 has noted, the Pit is the greatest and also *the most difficult* battle in MM7. If you feel that you aren't prepared well for the hell ahead then use Invisibility for reaching the Breeding Zone. A scroll is enough if you know where the Breeding Zone is in the Pit. Therefore:1. Pass the halls, reach the entrance to the Pit and cast Invisibility.
2. Run to the Breeding Zone, enter it, and heal yourself.
3. Get the Divine Intervention Book and cleanse the Breeding Zone so that you can cast Invisibility at the exist from the Zone. Cast Invisibility.
4. Leave the Zone and run to the exit from the Pit.
Return when you are prepared.