Perhaps Han Sen got lucky, but after entering Firetail Bamboo Forest, there wasn't any real danger. They saw a few Firetail Butterflies on the way, but they didn't pose much of a threat. Over the course of the next two days, Han Sen had managed to collect nineteen gold Core Lights.
Elysian Moon had a gemstone geno core, so those gold Core Lights were useless for her. Because of this, Han Sen was able to collect them all.
One thing Han Sen did not understand, though, was that Elysian Moon had a gemstone geno core. That meant she had to collect super Core Lights to level it up.
But with her power being what it was, how could she ever hope to take down a Super Geno Battle Soul, a king spirit, or any super creature, for that matter?
If she couldn't kill them, it really was pointless for her to enter the Geno Battleground.