Now that he had a clear enemy, he intended to take action. If one skeleton had been spotted roaming alone in broad daylight, then there would be more.
Ikaris feared the Black Fog and the countless abominations lurking inside, but he would never fear a single Undead. Instead of hoping and praying that an Undead Day wouldn't happen, he preferred to preemptively thin out their ranks while he could.
Conquering and seizing control of the Tartarus Gate and the surrounding forest became his new number one priority all at once.
For those who don't speak Korean or Japanese, Gumiho and Kitsune mean the same thing in two different languages. Even if the myths are similar, there are significant cultural differences just like the difference between eastern and western dragons. The reason I keep these different names is to make it easier to understand, but since Ikaris currently speaks the language of the Forsaken Lands, it is important to keep in mind that none of the words he currently speaks and uses sound like an Earth language, let alone English.
If you are unfamiliar with a term, I invite you to check the corresponding myth, even if I always add some twists.