In addition to this new ammo type, the update brings QoL features like a ship heading indicator on the map when at the captain’s wheel, item descriptions with helpful gameplay-relevant info for 80 items with more to be added later, and balance changes like increased damage for fire arrows and torches and decreased oil jar weight. There are also a wide swath of bug fixes introduced in the update.
Content retrieved from: https://massivelyop.com/2020/04/07/atlas-patches-in-fire-bolt-ammo-for-ballistas-bug-fixes-and-quality-of-life-improvements/.