Collusion

The Rainbow Rodent was a special type of mutant. Its origin was not extra-dimensional but developed from the over-polluted corners of this planet. 

In comparison to the extra-dimensional creatures that come from beyond the rift, its size was not something to boast about. On average, they grew to about a meter long but the emphasis was not on size but what was contained within—a type of toxin.

This toxin was what made people tremble in fear when encountering it.

Ever since the apocalypse, the first S-tier threat came from a tidal wave of these Rainbow Rodents that swept across the continent.

Its toxicity was comparable to the Hell Stone's polluting source.

To put it simply, it was extremely lethal.

Boom!

The air around Qin Feng burst into flames.

The runes clashed as the strength of the toxin grew. Since the rune's attribute was that of wood, extreme levels of heat should be able to destroy the toxin.