Your target is Galintari the Apocryphal. He's in a small skull-shaped surrounded by a graveyard hut in the middle of the zone.
If you simply rush Galintari, dozens of zombies will pop out of the graves and will wipe you. You can use the shovel you bought to dig up the graves so you can fight the zombies a few at a time. They won't despawn if they kill you though, so it may be faster to just take the death and clean them out afterwards. There's even a mender in the zone.