Crucible Wave 151 - Awakened Torment.
Quest:
★ Forbidden Ritual
□ Collect x items
The objective is a summoning. By collecting the prerequisite items required for the summoning, either on story mode (Campaign) and/or Crucible, a ritual platform will appear on each arena.
Here’s a crude example of what I had in mind -
http://i.imgur.com/f5Zhnp0.png (The sigils on each point of pentagram light up at each checkpoint from 100, 110).
Using the quest items, and perhaps some tribute points (used at wave 150, initially on Gladiator), the ritual will be complete. A rift then opens up on the platform that brings forth an extremely powerful entity.
Feedback and ideas to add to this are welcome. Thanks.