Of the most freakish horse archery missile weapon in the antiquity must be the giant double composite bow.
Asiatic Composite Bow by Markus Klek -- Homemade Asiatic composite bow constructed from rock maple, horn, and brass sheet. http://www.homemadetools.net/homemade-asiatic-composite-bow
Composite Bows: Weapon of Ancient Nomadic Equestrian Cultures
Composite bows were used mainly as sport for aristocracy in Tsou's time because they were far outmatched by crossbows. Archery competitions were popular.
Heretic Composite Bow: Top view by Samouel on @DeviantArt
Making an Asiatic Composite Bow
The Goblin Archer Boss gets the bonus dice from the Composite Bow it carries, but the Liliarch gets no benefit from a magic weapon such as the Orb of Darklight.
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BlackWidow Bow - back view by Samouel.deviantart.com on @deviantART