Sightstealer arrival
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Sightstealer Arrival is a major threat from the Anomaly DLC. Sightstealer Arrival requires monolith tier 1.
Summary
Sightstealer raids start with a single invisible Sightstealer from the map's edge, with no warning letter. Sightstealers will not trigger traps and generally will only be revealed when they're about to melee attack. They will trigger proximity detectors and emit a shrieking sound effect, which allows the player to know their presence, but not their exact location.
Multi-wave raids
At higher raid points, sightstealer raids can come in multiple waves. After the first sightstealer is killed, a "Sightstealer howling" message will appear, indicating that more waves are to come; their arrival time ranges from a few hours to a few days. The next raid will include more sightstealers. After being defeated, the "Sightstealer howling" message may appear again, indicating even more raids to come.
1-2 Shards can be dropped from destroying the each wave.