Though if Jim wants to bring them back, it's easy enough to posit a Ramp war-party having been deep in the Nevernever, and insulted from the Bloodline Curse.  Or alternately / similarly, to say that the "black, leathery" Ramp inside the fleshmask is originally some sort of nevernever creature (n.b. the Ik seemed to be of a similar sort), and there's more of them still off wherever the first one(s) came from.