Proteus was one of the most dangerous weapons designed during the Age of Might, when contention for the throne was at its most fevered pitch. Who actually created the shapeshifter is unknown, but what was known is that it was responsible for a number of deaths. It's last master was the sorceress Siren who used the creature to slay a rival and attain a seat on the Inner Circle of the Pentagram. Siren was defeated by the Outer Circle sorceress, Ekundu, working with a pair of mercenaries, Go-Tachi-no-Tatsu and Lotus Blossum, who had been given enchanted armor and weapons by Ekundu's ally, Jendai. Jendai, a member of the Inner Circle placed Proteus in a sealed brass urn, and Ekundu, now a member of the Inner Circle, placed it in the belly of a sea monster.
A thousand years later, the urn was found by a Lemurian raiding party, but its contents were unknown. It was at this point, however, that the seal was weakened and the creature within the urn began to slowly destroy the rest of the seal.
A battle raged over the site, and eventually the Atlantians drove off the Lemurians. But, hidden not far off was a German Untersee-boot, and they had seen everything. The U-boat's captain was astounded; he had never before encountered Atlantians. Well, no one did, except in legends like the Little Mermaid. After the Atlanteans left, the U-boat cruised in examining the wreckage. The only thing of interest was a brass urn, which was taken aboard.
In the Captain's Cabin the Captain opened the urn thinking something valuable must be inside. This was to be his last mistake. Proteus, being confined for so long had developed severe claustrophobia and burst forth from the urn killing the captain, and went on a killing spree through the U-boat.
Hubert Schneider, the lowly cook, was the only one left alive, and Proteus had him cornered in the galley. Hubert defended himself the best he could - by throwing can goods at the monster. Then Hubert had an idea, and opened a can of Vienna sausages. The smell of the sausages seemed to calm the creature, who settled down to munch on a can or two.
Hubert saw this as a great chance to tame the beast. This only took a few days because Hubert had raised hounds back on his fathers farm. Eventually Hubert was able to figure out the controls of the U-boat; he was the cook after all, and was able to surface. Freeing up a lifeboat, Hubert, and his new friend, Proteus, headed for shore. Surely thought Hubert who had dreams of presenting Untersee-Wolf to Grand Admiral Donitz, he would definitely get a promotion out of this.