User blog comment:Viperys/Konosuba Crack Theory (careful, spoilers)/@comment-28057182-20161111204034/@comment-29694966-20161112012321

I'm pretty sure Eris is doing a much better job as goddess. One of main reason for Eris to go to Konosuba in person is to retrieve divine relics after their owners had passed away. Considering how powerful and dangerous some of the divine relics are, it is important to seal those relics or return them to heaven.

I simply cannot imagine Aqua retrieving used divine relics or doing other complex tasks. Aqua has trouble remembering who she sent to Konosuba, so tracking the divine relics may be beyond her capabilities.