So, I talked with TravelLog. Assuming I am the first to finish a challenger, I shall try to defeat Dispater. If not or should I lose, I will help him with the technicalities. However, I would like to ask the rest of you if you consider this to be an okay idea. I have the advantage of knowing how I used to play Dispater, which might help me out. Just tell me what you think.
In any case, my challenger will not find Dispater. I am relatively sure I can figure another way around this.
Also, as a final note here, if anyone would be willing to combine his expertise with my vague ideas and mediocre skills, I would be more than happy to help. I have an idea about how to solve this, but the optimisation details may or may not be beyond me. This, however, only works if the challenger I work on will be the first in line to try. If someone is interested, get in touch through this thread or a PM.
Edit: By the way, the epic Fusion is still not optimised. For a level 70 character, you could take 140d6 backlash.