Ancient Pillars Pack is part of the Dungeon of Doom series. It is made of "Dwarvenite" and includes some metal and magnetized parts. This item was initially available as an add-on pack during the Dungeon of Doom Kickstarter. The item comes in three painted versions (standard red marble, limited edition white marble, and limited edition jade) and an unpainted versions.
Emperor's Palace Mega Pack comes with these following 8 pieces:
(4) Ancient Pillar
(4) Pillar Corner Post