The War Bat is a large bat found inside of tomb which can be entered through the tombstone found north of Brightleaf. To enter the dungeon, you need a Bat Orb or Forest bats.

Getting there

To make your way to the boss room, you will first need to obtain a Bat Orb are a good resource to get a Bat Orb as the speed at which you kill them is much higher. It should, on average, take no longer than 5 minutes to obtain an orb. Then you can enter tomb as you have the Bat Orb.

Drops

The War Bat drops 4 items upon death.

Resources

Equipment

Tertiary Drop

This can be obtained as an extra item roll rarely from all monsters. They will only drop if the monster is near your level (bosses not included)