As Xuan Hao dropped the small swirling vortex of fire down towards the spider swarm below, it seemed like some sort of restriction had been removed, causing the fire vortex to rapidly expand in all directions. By the time that the swirling vortex reached the swarm below, it had already grown enough to cover half of the spiders present inside the underground space.
FWOOSH-!
Not even stopping for a single second when faced with the natural formation of the spiders, the fire vortex directly burned through it like a hot knife through butter. Soon engulfing the spiders below, reducing them to nothing more than cinders that soon crumbled and became one with the ground below.
SCREEECH!