It was like they'd teleported into a completely different environment, really.
When the groundwater tore through the earth in its desperate rush towards the only man it deemed worthy to control it, the floor beneath both him and Eris crumbled away.
The soil mixed into the massive waves and was swept away to somewhere random. Massive chunks of rock and stone were broken apart until they were crumbs and thrown out of the newly created lake entirely.
The battleground on which August and Eris had been fighting was sunken deep into the ground. They were now fighting an aquatic battle in a field of August's creation.
Naturally, the darkness domain was disrupted by the sudden appearance of so much water. Even more so when Eris was swallowed into it.
She diverted her focus to precision control. Using the darkness present inside the water itself, she propelled herself out of the waves and into the air where she currently stood.