The Dancing Spectres

At first, they appear to be your typical undead couple, but at second glance, you'll find that these two (Paula Abghoul and Fred Ascare) have made dancing into a deadly art. Free to roam through solid objects like true specters, they'll quickly dance around while attacking with a pair of lances. Using those lances, they'll crowd you into corners, striking you multiple times. As is their pattern, they'll sometimes throw 3-directional lances in your direction, following that up with a elongated-lance dash attack. To make all of this worse, they'll flicker in and out of visibility. Although visually unimpressive, they're tougher than most.