"Why is Lind's so hard?" Annabelle was petting Ethry as both stared at Lind suffering in a corridor of molten stone. He had started in pure fire, then slowly transitioned to molten stone all around him that was dripping from the ceiling and pooling in corners.
He was sweating profusely and had downed at least 3 elixirs to keep up with his Qi consumption. Compared to others they watched, Lind was truly being punished effectively and they could see the various corridors around him were of all elements and combinations.
Athena, for instance, seemed to have to overcome a heavily trapped maze. Most were lethal, or at least crippling, while Bastion faced aether beasts standing between him and his advancement.