Companion Cube Terraria. It’s the hardest item to get (imo) because you can’t farm it, you just have to wait for that guy to decide to sell it and it’s superrrrrr expensive. The angel halo is the rarest item sold by the travelling merchant, not the companion cube.
It appears almost identical to the weighted storage cube but with a pink heart replacing the aperture science logo. When was the companion cube added to terraria? More posts from the terraria community.