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A note on the Elemental Air Spear Throwers: The trolls have only recently developed ship-to-ship weapons. Previously, they would rely on close flybys to deliver Boarding parties via Great Leap. The fiction portion of the book notes that these are hollow tubes mounted on the bow or alongside the hull, out of the way of the oars. They fire shards of elemental wood, earth or crystal (sometimes tipped with iron, living crystal, or True Earth) by a cocked hammer mechanism hitting a kernel of Air in the base chamber. The large spears can get some really high damage step and, "the most powerful of these spears can crack or even split the stone hulls of the Theran ships. Spear-throwers aimed at crews can be loaded with clusters of smaller spears to create a scattershop effect. The Swiftwind moot developed the Spear Throwers and makes the most use of them, followed by the Stoneclaws, Iron Mongers, and the Thundersky moots." We can see from this description that the devs really developed the troll cultures in separate ways, with some using ballista, some spear-throwers, some catapults - each with their own specialty ammunition.
Still researching those maintenance rules today.