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A ballista is a siege weapon very similar to an enlarged crossbow that shoots javelins or large-sized bolts with a force many times those of a human. It is capable of damaging ships and buildings, and can be used as armaments of conventional and spelljammer ships.
- Gary Gygax (1979). Dungeon Masters Guide. TSR. ISBN . pp. 53, 108-109.
- Jeff Grubb (1989). AD&D Adventures in Space. TSR. ISBN 0-88038-762-9. Concordance of Arcane Space. p. 41.