The main danger of anomalies was that they could appear anywhere, anytime. Even the Citadel was no exception, but it was protected by powerful Phantoms that immediately dispelled all attempts of energy to turn into anomalies.
However... Dead Lands was a different matter. It was the perfect place for anomalies to appear because no one was going to prevent it, and moreover, in Dead Lands, there were constant battles that were a source of discharged energy.
Thus, it was not uncommon for anomalies to appear in popular places among the Phantoms and monsters, causing more monsters and Phantoms to come there, it was a snowball effect and a loop.
"What the hell is this...?" Olax muttered in disbelief. Sure, an experienced Phantom like him knew what was happening now, but he just couldn't imagine that their luck was so cruel.