The Uzumaki arm in Bloodlines appears to be tied to the Uzumaki progression and gives access to sealing-based abilities, especially the Adamantine Sealing Chains style and related effects. It also seems to help with the Uzumaki-specific skill path rather than being just a cosmetic item.

What it does

  • Grants access to Adamantine Sealing Chains through the Uzumaki progression.
  • Boosts chakra-related stats, with sources noting +30 Chakra and +1 Hunger Bar for the Uzumaki clan.
  • Improves sealing abilities, including an Extraction Seal related skill path.

In practice

From showcases and guides, the Uzumaki progression is used to:

  • Apply sealing effects on attacks.
  • Use chain-based attacks with a big hitbox.
  • Unlock an awakening-like mode with utility and control effects.

Simple takeaway

If you mean the Uzumaki arm/clan feature in Bloodlines, it’s mainly about sealing power, chain attacks, and chakra bonuses , not raw damage.