The area was right and they had taken time with other matters. They also had the entirety of the world and the grand elemental planes put in to perspective. The vast beyond where manas clashed in chaos were something that none of them could properly understand.
So why were they waiting to try and make an elemental plane in to a dungeon when they had some clarity brought to them?
Su wore armor that helped defend against fire mana specifically, she knew the weight would be great and that she did not have the same ability to bond with or share mana with the elemental plane. Remey did because she was able to easily absorb and use the fire mana to temper herself. Su did not have the same abilities, so for her this was resistance and pressure until Remey and Walker could manage what they needed to.
