What is this object/hero/troop?

I was looking through some of my defense records recently, and a particular attack caught my eye:

Defense log screenshot

What interested me was the 'troop' beside the archers. This is what it looks like in the replay (pretty much the same):

Replay screenshot

I don't know what this troop/hero/object is. My only theory is that it may be donated troops from a previous clan (as this player has no clan).

So, what is this mysterious item?

clash-of-clans

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