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While Kireina was fighting her opponent, a lanky skeleton wearing black armor and wielding two swords had appeared before Brunhild and the twins Ariant and Eriant.
"Heh, you're not half-bad for being some cockroaches. However, now that you've been slashed, your life will soon be over."
If Kireina was here in the flesh she would had immediately recognized him as a Necrotic Death Lord, or an Overlord, depending in the ranking.
Brunhild and the twins naturally felt confused about this individual, they had no idea who the heck he was, but they were certain he was an incredibly high ranked Undead.
"W-What are you talking about- Unggh?!" Brunhild suddenly felt an enormous pain in her wound, as she vomited a mouthful of black blood. Her internal body felt as if it was slowly being melted away.
"Brunhild!" Eriant panicked.
"W-What did you do to her?!" Ariant asked.
Check "The Protagonist's Sister Is Actually the Strongest"!