Range
According to the understanding that Ryu had come to, the Chosen Rune was both a blessing and a curse. While it gave certain advantages that could be claimed at a later date, it also increased the difficulty manifold at the same time.
For every given period of the time that passed, the Chosen Rune would release a pulse of qi that would be greatly attractive to beasts and a pillar of light that could be tracked by cultivators. Every time this pulse of qi and light was produced, the former would spread wider while the latter would persist for longer.
Just now, Ryu had experienced the first pulse and the next was quickly approaching. This first one hadn't been nearly enough to cause him big problems as it only pulled in beasts from about the surrounding kilometer range and the light hadn't persisted for nearly long enough for challengers to lock onto his location. However, as time passed, it would become increasingly difficult for him.