Another Plea for Iron Twins! Please Please remove the Energy Cost so it's Viable
I'll start by acknowledging that yes, 6x20 energy is less than 1 Refill and is not a big deal on it's own. That being said, Iron Twins isn't worth doing for most (especially newer) players because if you DIE then you lost the energy but not the Key. Suddenly its not 6x20 anymore, depending on RNG it might take 3 tries to clear the stage. This is the number one reason people aren't doing it, the loss of Energy makes it not worth doing until you have a 100% Team.
Most people don't run Hard 10 Dungeons (or really any Dungeon) without a 95% or higher clear rate for their team. Getting Soulstones has been a huge pain point for such a large part of your playerbase, I don't know why this hasn't been addressed. Iron Twins was great before the Brimstone Rebalance. Your data probably shows Sunday for the 2x is the day the majority of players run it. You've really made Blessings a critical part of the game and the Real World prices for Soulstones are still ridiculously high.
Yes, the 8x Wishlist was a good start to improving the system but Blessings and Mythics have been the largest Gap-Widening changes between the most dedicated Casual Spenders and F2P vs. the High Spenders.
Also, for the love of all that's holy, PLEASE change Eternal Soulstones so they ONLY ONLY ONLY can generate souls for Champions you have in your Roster. I'd like that change made for all, but I'll be reasonable on this. Finally getting the Eternal Soulstone takes so long and it's supposed to be a huge reward. Then you use it and you get a Rank 5 Leggo Soul for a champ you don't have...
EDIT: From feedback I had another suggestion: Keep the Energy Component BUT Refund it if the battle results in a loss. That would also solve the problem that a lot of players have with running it. The key issue is the Energy Waste that occurs on a failed run