Back to dabbling in my horse AU again with more of these two. Shadow Lock on the left is a comic canon only character, who is Stygian's descendant in modern Equestria. Stygian on the right is from Season 7 of MLP:FIM.

There's a huge emphasis on their relationship to one another as eventual family in this AU, but their first real meeting doesn't go well at all. Shadow Lock has an ingrained fear of the Pony of Shadows in his comic arc, while Stygian is "dark magic scarred" from his time as the Pony of Shadows, which manifests itself as temporary spooky eyes, a discolored mouth, and his magic color turning dark grey to black. It immediately puts Shadow Lock on the defensive thinking the Pony of Shadows is still residing within Stygian.