Drops from: Endgame world drop in Tier 3 zones (rare). Drop rate: 0.2-0.3% (community-reported).
At a sub-1% drop rate, expect a long farm. Most community runs report 60-150 boss kills before a confirmed drop. Set up a fast travel rotation and bring a reload-speed-focused build to keep the kill cadence up.
Source: Community-reported. Drop confirmed in r/borderlands4 by 6 separate players. · Verified for Patch 1.4 / 2026-04-22.