In Assassin's Creed: Odyssey, whether Odyssey swears service or meets the blood wolf, you can refer to the following:
Assassin's Creed Odyssey Blood Wolf is best left unkilled.
1. When you meet the protagonist’s father, Blood Wolf, you can choose whether to take revenge. It's best not to kill the blood wolf, as it's easier to achieve a good ending if you don't kill it.
2. If you choose not to kill, you can get a blood wolf as a crew member in the later stage, which is a legendary level and can have a true ending. If you choose to kill, the little brother will jump out and question you after the killing. There are two dialogue options to choose from, but if there is a time limit, you will choose to kill directly.