Twelve-Winged Dark Seraphim
Goddess Ba and Wang Mingyuan are now the only two who have climbed the steps. While Goddess Ba was rewarded and reached Apocalypse, it seems like Wang Mingyuan didn't get anything. That feels like an indicator that the rise to Apocalypse is not the true reward. I think the real reward will come through some sort of battle. Why? Because every other cube battle had some sort of fighting involved.