Killing Magic Fern notices Frieren acting suspiciously and follows her to several unusual and dangerous shops. Frieren admits despite her efforts she has learned almost nothing about Fern and was trying to think of a gift for Fern’s birthday. Fern is happier knowing Frieren at least tried to learn about her. Frieren decides to revisit places she visited with Himmel, Heiter and Eisen. The first place is a village where Frieren sealed away Qual, the Demon of Corruption. The seal will break soon so Frieren must defeat Qual. She is surprised to learn Himmel checked the seal every year until he died and was always confident Frieren would visit before it broke. Frieren reveals Qual invented a killing spell that bypassed all barriers and armour to strike the body directly which was so powerful at the time she could only manage to seal rather than destroy him. Qual is unsealed but Frieren reveals in the eighty years he has been asleep human mages learned and reverse engineered his spell, allowing them to develop new defense spells to block it. Unable to harm them, Qual is easily killed when Frieren uses his own spell on him, which he does not know how to block. Frieren realizes the village elder is a boy she met at the village eighty years ago, reminding her fondly of Himmel. Fern also points out Himmel must have had deep trust in Frieren to be so certain she would return to deal with Qual.