In Seraphim we have many sailors and we are always ready to take you out to hunt a whale! Whales appear around the sea at BDO and they can only be killed with hunting rifles. Once a whale appears, the server gets a notification. Then, we have to gather a party of hunters. You can use @whale hunters tag on discord to gather a party together. You will need 4-5 rifles per person since there is no chance to fix them on the ship and a butcher knife to get the loot. The sailor will take you out and follow the whale as the hunters shoot to kill. It can take up to 30 minutes to kill a whale. It will give you whale meat, oil, and tendons as well as other items once you butcher it.
You can learn more about whale hunting here.