A Grettinorn is a triple-crossbreed between an Grendel, Ettin and Norn. These can generally only be produced ingame by first splicing a two of the species together, and then splicing the result with the third species. Since Ettins do not exist in Creatures 1, these may only be seen in the later games.

Compare with Grettin, Grenorn, and Nettin.

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