This is a nice one. I've used it to get the killing blow when I had no Eddie meter.
Corner only:
623S, 41236PKS(quick tap to negative edge j.SG), PKS(1hit SG), j.d, land, j.k, j.h, j.d, land, sj.h, sj.d
50% tension instead of the 25% from normal Damned Fang FRC but some decent damage and great if little eddie is on cooldown.
The damned fang frc is not seen often, I would imagine, because most 623s would be in a pressure string as a tick throw with little eddie out. The followups for damned fang with little eddie are varied by char and weight, but you can do a lot of things. It's Eddie.