Hello, I know those topics are new and exciting and so on ... but I had this idea during one of my countless Karazhan Attumen runs. I am myself a dedicated mount farmer, with more or less no drop luck so far. I'm farming ZG, MT, Stratholme, Sethekk Halls and Karazhan mostly each reset.
This is just a re-skin of old mounts, but we hadnt this before. It's a Spectral Charger, and imagine his skin on other mount types. I like this cheap undead mount style, so a mount exactly like this would be good enought.
Now where could it probably drop? I'd say it perfectly fits in the lower Karazhan (if it ever gets released) or maybe a heroic Arugal drop in Shadowfang Keep.