Skeleton Raiders - Act 1 Side Quest
Start Location: Megara
Quest Location: Kerata Forest/Old Eleusis
Objective: Defeat 3 named Skeletons in Old Eleusis
Skeleton Raiders is a side quest that you can pick up from Nierus in the town of Megara during Act 1. There are a few other NPCs in town that you can speak to in order to learn more about the Skeleton Raiders but it's not required to do this part.
For this quest you will need to travel to Old Eleusis and into the large mausoleum that is here. Inside you'll find 3 named skeletons that you need to defeat, Polypus, Menon and Aristeus. Each of these enemies is in a different location inside of the mausoleum, use my screenshot below if you need help locating any of them.
Additionally, if you need help finding the Old Eleusis ruins, check my screenshot below too that shows exactly where you can find this location on the map.
Polypas ~ Prince of the Blade in Old Eleusis.