"The air itself eats you."
Charge-up SMG with extended corrosive DoT — one tap to apply, swap weapons to let the DoT finish the job.
damage
280
fire Rate
8.4
magazine
50
reload Time
2.5
element Chance
28
Drops from: World drop in Mid-game. Drop rate: 0.7-1.0% (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. · Verified for Patch 1.4 / 2026-04-22.
Corrosive eats armored enemies and is the recommended element for Ordonite Processor and Rust Tyrant farms. Less efficient against shield-only or flesh-only mob types.
The natural fit for Ambient Decay is Rafa's Grenadier tree (corrosive grenade synergy). Stack the relevant capstone before farming the deeper raid tiers — the build planner at /builder/ lets you preview the synergy.
A epic smg like Ambient Decay earns its spot when the rest of your kit covers the gaps it leaves. Pair it with a longer-range crit weapon for ranged engagements. See our walkthroughs for boss-by-boss build recommendations.
Methodology note. Stats and drop rate ranges on this page are aggregated from public Reddit megathreads and gameplay video archives, cross-checked against community-tracked spreadsheets. We re-verify after every major patch — see how we verify drop data for our process. If the in-game numbers diverge from what you read here, email us at [email protected] and we will investigate within 48 hours.