C2394 Rebirth by Drip of Blood

The Reincarnation Pillar was created by Ancestor of Human Race when he was the only one who fought against Chaos Emperor. He took out a sliver of the Reincarnation Spear from Ancestor of Human Race's hand.

But in the end, it was not the complete Reincarnation Insight, so it was only a hundred or so pillars, not a piece of the complete Immortal Monument