This is a cross-over fan fiction I wrote a while back, before I ever got the idea for "Second Life as the Sister of a Goddess." I have never actually posted it anywhere permanent, I was just posting chapters in the LCD for Death Mage (Full name, The Death Mage Who Doesn't Want a 4th Time.)
Since this was originally posted in the LCD for Death Mage, it assumes the reader has a lot of knowledge of the Death Mage lore while picking up the slack for the reader quite a bit more on the Overlord end.
The setting is that Sam, Van's ghost carriage friend, has evolved to a point he can carry people between worlds. Van is currently on vacation, and has brought along Sam (of course, because he's the driver,) Rita, Saria, Gufadgarn, and the ghosts who are always with him. Everyone else stays back in Talosheim.
On the Overlord end, it is soon after Ainz has taken control of Erantel. Literally, chapter 2 clips chapter 1, part 1 of the 10th lite novel in its entirety in order to more accurately introduce Ainz, only changing a piece of the very ending in order to modify it from traveling to the dwarf kingdom to them taking notice of Van and his party.
Anyway, I've received some demand from the LCD readers to re-post this story in a more accessible place. So, I will begin posting it here.