Maybe you have other champs in your roster that are more usefull to 6* to complete the quest. Just start with them, it takes some time to 6* champs anyway. Untill you have two or three other champs at 6*, you probably got Dark Elhain, who has a much higher value than Dark Athel.
The limiting parts in this game are not champs or shards. The limiting parts are silver (to gear your champs, you don't want them to fight in unleveled artifacts), energy (it takes thousands to bring a champ to 6*), real life time (and I allready play much more than I should), but definetly not champs. I have the following champs in my vault, that I want to make 6* later on, but didn't yet due to the limiting factors I mentioned:
- Legendary: Karato Foxhunter, Yannica, Basileus Roanas, Samar Gemcursed, Kantra the Cyclone
- Epic: Husk, Rearguard Sergeant, Skytouched Shaman, Fahrakin the Fat, Mordecai
All of them are worth 6*. If I would have 6-starred useless champs like Dark Athel, this list would be longer and longer. You do yourself a favour if you save some resources, then you are able to bring a champ worth 6* to that level immediately as you get him.
no i already have 3 6* champs and i dont have dark elhain yet. wdym