Schelch

The schelch is a large, deer-like cryptid that reportedly exists in central Europe. Its name is a German word for an unspecified species of deer mentioned in the Nibelungenlied, a Middle High German epic poem.

6th century B.C.
Gold and bronze engravings on Scythian artefacts from the Black Sea during the 6th century B.C. may depict the schelch. Alternatively, it may show knowledge of fossils from species like Megaloceros or Eucladoceros.

Nibelungenlied
In Adventure XVI, Siegfried - a legendary hero in Norse mythology - slayed a bison, a moose, four aurochsen and a schelch. "Thereafter he speedily slew a bison and an elk [moose], four strong ure-oxen [aurochsen], and a savage shelk."