A Kaguya arm in Bloodlines Roblox is generally used as part of the Kaguya bloodline progression, giving you access to bone-based combat effects and related abilities tied to the clan’s style.

What it does

  • It fits the Kaguya kit, which is centered on bone attacks and aggressive close-range pressure.
  • In Bloodlines progression content, Kaguya-related showcases and guides treat it as part of unlocking or using that bloodline’s moveset rather than just a cosmetic item.
  • Marketplace listings for “Kaguya Arm | Bloodlines” also describe it as an in-game item you receive for Bloodlines

In practice

  • Expect it to help with Kaguya-themed abilities, especially bone or arm-based attacks.
  • Players usually care about it because it belongs to a stronger progression path, not because it changes appearance alone.
  • If you saw it in a trade or item listing, it most likely refers to an item connected to the Bloodlines Kaguya progression.

TL;DR

The Kaguya arm is part of the Kaguya bloodline setup in Bloodlines and is tied to unlocking or using that clan’s bone-focused combat abilities.