Mushoku Tensei Post-Story: Eris and Her Son Both Settle Fights by Cutting Off Arms

Across 320 comments on a Japanese video breaking down what three Mushoku Tensei characters become after the main story ends, the top comment (3,408 likes) isn't about power scaling at all — it's fans clocking that both Eris and her own son settle an argument the exact same way: casually cutting off an arm.

From there it escalates into a running bit about the entire Greyrat family being absurd. Getting into both a university and a noble swordsmanship academy is treated like basic compulsory education, one kid becomes a North Emperor as a teenager, Rudeus's children are all taught uncanted magic and blade work directly by legendary masters, and even Rudeus's own middling #7 ranking on the "Seven World Powers" list turns out to be a genuine honor once someone explains the history behind it. A side plot about Isolte gets fans debating just how strong she really is compared to Eris and Roxy.

By the end, more than one commenter has half-jokingly concluded the franchise's real final boss fight is just the entire Greyrat bloodline showing up together.

This one's a Japanese fan channel breaking down light-novel-only epilogue material — what three Mushoku Tensei characters become after the main story wraps — and 320 comments in, almost nobody's talking about power scaling. They're talking about arms. Specifically, whose gets cut off, and by whom.

• Rudeus's trauma, right there.466 likesJPルーデウスのトラウマ@Luvvbyte · 466 likes
• Wait, does this world even have healing magic?196 likesJPこの世界って治療の魔法ってあるんか？@山田太郎-t4m7k · 196 likes

Turns out this world does have healing magic. It just, notably, didn't work on that particular arm.

From there the thread pivots to how Eris settles the exact same kind of argument with her own son, years later, using the exact same method — and the replies aren't entirely on board with treating that as just a fun family bit.

• It grows back though!55 likesJP治るからね！@どこにでも現れるおばば · 55 likes

Once the arm jokes run their course, the thread turns into a genuine, escalating bit about how absurd the Greyrat family is as a whole, brains and brawn both. Getting into both a university and a noble swordsmanship academy is treated like basic compulsory education around here, not some rare achievement worth bragging about.

• Being elite at even one of those would be impressive, and for this family that's just the starting line. No wonder they produce a world savior and a #5 and #7 ranked strongest-in-the-world lol61 likesJPどちらかだけでもエリートなのに両方を出てからがスタートラインだから超絶エリート家系 そりゃ世界の救世主や列強五位や七位が出てきますわｗｗ@てらでいん · 61 likes

• Becoming North Emperor in your teens is, to put it mildly, absurdly talented.89 likesJP10代で北帝って控えめに言って天才すぎないか@電電-c1g · 89 likes

Even Rudeus's own comparatively middling #7 spot on the "Seven World Powers" ranking gets rehabilitated partway through the thread, once someone actually explains the history behind the title instead of just the number — a small but pointed reminder that this fandom does its homework.

• By Rudeus's era the "Seven World Powers" title has fallen out of fame, but it used to be a name that shook the entire world — so being ranked #7 is still a genuine honor.95 likesJP『七大列強』、ルーデウスの時代では名が廃れて知名度が低いですが、昔は世界に名を轟かせていたランキングなので、７位でも十分名誉あることです@猫草-p8n · 95 likes

A side plot about a character named Isolte pulls the thread into its own mini-debate — specifically, how she stacks up against Eris and Roxy in a straight power comparison, and whether the family's own tier list even holds up anymore.

By the end, more than one commenter has half-jokingly concluded the franchise's real final boss isn't any single villain — it's just the entire extended family showing up at once, grandkids and all, and nothing standing across from them is walking away undamaged.

Which, given absolutely everything else in this thread, checks out completely. At this point the Greyrats aren't really a family so much as a standing army that just happens to also attend school on the side.