Fairy piece idea: Fourpawn

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Clicktuck

Moves like four pawns (see image, all paths are legal (blue = normal; red = capture) as long as capturing for a red path is possible)

Can only en passant as it's first move when present

Oh yeah, when it promotes its four promoted pieces form a chain attached to the initial fourpawn

Cannot promote to give check, checkmate, or cause stalemate

It would be worth 6 (or 7) points