Sisters

Yngvi's eyes widened at the mention of exterminating the Ice Giants, a menace they had battled for centuries - "How can we do that, descendant?" - he asked, his voice a mix of fear and frustration. "We've slain hundreds of them over the centuries, but they always come back, crawling up from that cursed hole like stone-eating ants." 

Henry could sense the weariness hidden behind Yngvi's seemingly angry expression - "Boris mentioned that they appeared a few years after my ancestor left this valley, correct?" - Henry asked, seeking to clarify his doubts. Yngvi nodded. "And do you know where they come from?"