It still took Blake quite a while, but he eventually arrived back into the middle of the humanoid demons' base faster than before now that he had learned how to pseudo-fly using his current wings and the explosions of the dark flame that could propel his body wherever he wanted.
Just as he had instructed Cyra, the two of them, Cyra and Robus, destroyed everything in the humanoid demon's base, killing many humanoid demons and taking their souls.
There were literally hundreds of humanoid demons in the base, which means there would be even more souls for the group to take. And considering one humanoid demon usually not only gave one single soul worth of souls, the group could literally get twice the amount of souls from the initial hundreds of humanoid demons.