Chest golem

Inventory power. The golems str increases by 1 per 50 lbs in its inventory and its dex decreases by 1 per 150 lbs

Immutable Form. The golem is immune to any spell or effect that would alter its form.

Multiattack: The golem can make 2 melee attacks

Slam. Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 20 (3d8 + 7) bludgeoning damage.

Consume Item: The Golem looks for any nearby item that it can grab (this includes items that pcs are holding (if the golem finds this item do a contested dex save where the golem had disadvantage)) and plunges the item into itself to add the item into its inventory

Item Spew: The golem opens itself and spews 1d20 items in a 15 ft cone in front of it, an enemy in this range makes a 19 dex save on a fail the creature takes 2d6 damage on a success half this

Attack: The golem makes an attack with an item it has equipped for example: Rapier 1d8 piercing  

Retrieve Item:  The Golem plunges a limb into itself and retrieves an item from its inventory and equips it