Scarabs

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Scarab are a type of map fragment.

Used in a slightly different way than maps. They are placed in additional slots of the map device for their unique effects.
There are 14 scarabs in Path of Exile: Ambush, Bestiary, Breach,  Cartography.. Torment.

There are more and more of them with each new league.

They obtained from Immortal Syndicate missions.