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How to use a Scarab?
Let's take Rusted Perandus Scarab as an example. It has the following mods: Area contains 2 additional Perandus Chests, and Area has a 33% chance to contain Cadiro Perandus.
Put this Scarab along with a map into a Map Device:
Activate it and enter the map.
You can press Tab to see all the mods for this map: