Overview
- The Infestations update went live Tuesday, June 2, 2026 after Bethesda took servers down for several hours to apply the patch and start Season 25: Appalachia Under Siege.
- Infestations are dynamic hostile encounters that can appear at roughly 40 map locations, spawn concurrently on a server at about five at a time, and disappear after several hours if not cleared.
- Completing Infestations rewards four‑star legendary weapon and armor mods drawn from a new split system that uses a common pool plus activity‑specific exclusive pools to protect raid‑only top tiers.
- The events are designed as joinable public encounters that do not require premade groups so players can organically team up on the overworld to tackle harder bosses.
- Bethesda iterated the feature in public test servers and says it will monitor live telemetry to tweak health, spawn rates, and rewards with the aim of helping players gear up for endgame raids without replacing raid content; four‑star mods were first introduced in the Gleaming Depths update in December 2024.