Chain-shot is a unit of ship ammunition which can be fired from an onager. It consists of six links of long chain bristling with bolts, spikes, and barbs.
When fired at a target ship, chain-shot binds its sails, fouling them until such a time as they are cleared. If coated in dragon's tears, the chain-shot will also cause the target's sails to catch fire.
When fired at sea monsters, chain-shot will slow, but not stop, the creatures movement speed for a short time.