"Find the second enchanted skeleton" is an objective in the quest The Bloody Harvest in TK Bahas Bloody Harvest DLC
Time to head into the next section of the Necropolis, which can bring you into the Church of the Dead. Here you will find Graves that you need to dig up to reveal the next Enchanted Skeleton. it is likely accompanied by a Reanimated Psycho so be careful.
Destroy him to see the next item: Enchanted Ribcage