Possessed Pillar 2014

While the pillar remains motionless, it is indistinguishable from a statue or a carved column.

The pillar is immune to any spell or effect that would alter its form.

The pillar has advantage on saving throws against spells and other magical effects.

The pillar's weapon attacks are magical.

The eldritch magic that powers the pillar produces a magnetic power that seizes metal objects that touch it, including metal weapons. When a creature successfully strikes the pillar with a metal melee weapon, the attacker must make a successful DC 15 Strength or Dexterity saving throw or the weapon becomes stuck to the pillar until the pillar releases it or is destroyed. The saving throw uses the same ability as the attack used. The pillar can release all metal weapons stuck to it whenever it wants. A pillar always drops all weapons stuck to it when it believes it's no longer threatened. This ability affects armor only during a grapple.