Awakened Cavaliers are the paragons of Palawa Joko's undead army. They appear to have been human. They are often seen in the groups of undead roaming the Desolation.
When facing them consider bringing Frozen Soil, as their use of "We Shall Return!" can make defeating mobs with multiple of these in very difficult otherwise (particularly in hard mode), due to their ability to resurrect all foes in their group instantaneously and repeatedly.