Nasobem

Ah, the Nasobem. Scant records exist of this elusive species, which is rumoured to persist in the Mekong-delta in Vietnam. Unfortunately I did not manage to see it when I was in Vietnam, although I did hear a curious snuffling noise in the underbrush once. Might have been a Nazgul, though. I did find this depiction on a piece of parchment in an old pagoda near Cần Thơ:

An octopus doing in the brackish waters of the Mekong?
You just can't trust those ancient sources.