Bloodhound Knights are slow moving adversaries that can easily get behind you and attack before you even know what happened. However, there are only two boss variants for you to discover. In Elden Ring, you will get some points to defeat them.
In Limgrave, the first Bloodhound Knight you may discover in the whole game is a boss. It is home to Bloodhound Knight Darriwil, who is not required to defeat. However, it may be difficult to challenge this boss as soon as you enter the Lands Between. For example, the Bloodhounds Fang pistol will be given.
After reaching the lake, you will eventually fly past Stormveil Castle to the land of Liurnia. The Lakeside Crystal Cave is home to a wide array of magical beings and deadly foes. Follow the cave to the bottom and you will be taken down by another Bloodhound Knight. The Cerulean Amber Medallion will be awarded for your effort.