The mod adds two functionalities to the bow and arrows. The arrows’ gravity is set to 100 which means when you are firing an arrow it will be fired exactly at the point where you were aiming it. When the arrow hits its target it will deal a maximum amount of damage which will instantly kill its target and also set it on fire. If you are firing at an ordinary block and not a mob it will only be set on fire.
The only thing you need to get started is a bow (ID: 261) and arrows (ID: 262).