Lord Death Slayer (later referred to as Lord Doomslayer) is the video game rival of Stan and Luke in My Sister is a Witch. Later Ashley deals with him.
He describes himself as a 49th level Necroknight War Dancer.
Lord Doomslayer works at the Geektopa store.
His real name is unknown as that is his alias on World of Wonder, probably a parody of World of Warcraft.
He describes himself as a 49th level Necro-Knight War Dancer.
When he calls Ashley White "beautiful" and offers to teach her "real magic" she transforms him into a snail likely using Animalize Human.