Pillar Greathammer

 is a Unique two-handed mace in Outward.

Description
"Artifact greathammer of an executioner who guarded the Spire of Light, crushing the bones of invaders before feeding on them."

Acquired From
Can be found in the Spire of Light, next to the Legacy Chest. Simply interact with the black wall on the right.

Trivia

 * Pillar Greathammer is likely a reference to Smough's Hammer from Dark Souls 1 as the descriptions are very similar, however it closely resembles Morne's Great Hammer from Dark Souls 3.