You can obtain this map by vendoring three Excavation Maps or three Shaped Thicket Maps.
Kill Burtok, Conjurer of Bones in Necropolis Map while you are affected by Bone Roil and he is Bleeding.
Path of Exile 3.13 Ritual – Kill Burtok while you are affected by Bone Roll and he is Bleeding
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Necropolis Map Boss
Burtok, Conjurer of Bones (Giant Bonestalker)
Creates a circular arena of bones around you at range, similar to Vaal Glacial Hammer.
Spawns Bonespire Talisman effect at the location of the above arena. Casts a short time after using the above skill.