Erdeta could fly, and the new format of this world was filling her with power everyday, so in a sense she was as free as a bird. The red-air within the atmosphere was very empowering, so nowadays, she could fly for ten kilometers at a time, without landing anywhere to make pit stops!
She traveled such distances in just a minute as well, so necessarily, most demonic monsters wouldn't even be able to catch up to her, in any hunter/huntee situation. She was safe, and potentially one of the fastest 'evasive mages' around, because common mathematics confirmed that she could travel up to 600 km/h at her best!
Erdeta had to slow down a bit if she was to figure out where the 'giganto monsters' resided, but overall this new, merged world did not threaten her much. This recent, demonic world wasn't just a haven for necromancers, tons of mages such as her, benefitted from it as well.