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In The Colour of Magic, Rincewind and Twoflower meet Tethis the Sea Troll, a being from Bathys, another planet, who fell to the Disc. Tethis and Twoflower get into the Potent Voyager, and Rincewind ends up hanging onto the outside, as the Voyager launches.

In The Light Fantastic, which follows on directly, Twoflower and Rincewind fall back onto the Disc (sort of; arrangements were made: if memory serves the Great A'Tuin does a barrel roll under the influence of the Octavo and sort of catches them), but there is no mention of Tethis, not in this novel nor, that I remember, in any other. Ever. Nor did Terry Pratchett ever mention him in interviews / online from what I can find.

However, I haven't read every Discworld publication (the final novel, the YA stuff, nor most of the companion books such as the diaries or maps), and my searching skills aren't stellar.

Is there any canon information on what happened to Tethis? Or, in the absence of that, any really good speculation (I am, of course, not looking for discussion; but there's a lot of magic on the Disc, and from established events there may be a decent explanation even if it was never outright said in canon).

NOTE: I am open to the possibility that Pratchett simply thought "bugger it" and pretended he didn't exist. These are the first two instalments after all, and the author admitted he was still getting to grips with the setting (check out the Patrician in the first books, compared to the last). But hopefully, if this is the case, he mentioned it somewhere.

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    @AncientSwordRage, I won't rollback, but Pterry was intentional ^^ in case you thought it was a typo – Mac Cooper Jan 22 '16 at 0:03
  • I figured it was some deliberate, not so clear, allusion to Terry Pratchett. – AncientSwordRage Jan 22 '16 at 0:11
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    @AncientSwordRage fans often know him by that; i believe he used it to sign off on usenet way back (cough before I was born most likely). Plus I'm insanely lazy and he has a long name. Either way works! – Mac Cooper Jan 22 '16 at 0:12
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    He didn't sign himself Pterry but alt.fan.pratchett called him that in the spirit of the Ptracy etc characters in Pyramids – Kate Gregory Jan 22 '16 at 2:05
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    a.f.p. was massive for pterry fans in the early 90s. Pterry posted there regularly (acknowledging the pterry name, but indeed not generally using it himself to sign off), the annotated Pratchett file started there, the Cripple Mr Onion rules, etc, etc. – Tony Meyer Jan 22 '16 at 6:12
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Unknown.

As you say, Tethys was never mentioned again in any later Discworld book nor mentioned by Pratchett in interviews. The Terry Pratchett Wikia has this to offer (emphasis mine):

Tethys is an alien to the Discworld, and the only sea troll on the Disc. He used to be a "meatman" (the water-world equivalent of a fisherman-- he hunted wild game on prairies) on his home world of Bathys, where he fell off the edge, froze solid, fell through space for some time and finally thawed out as he approached the Disc's Sun, and landed widdershins of Krull, where he was eventually captured and made a slave. He has considered jumping over the Edge to find his home world again, but has never found the courage.

Tethys' fate is unknown. It is presumed that he entered in the Krullian spaceship after Twoflower, but when Rincewind and Twoflower were brought back to the Disc by the Change spell, the sea troll wasn't there. Maybe he somehow found his way back to the world of Bathys and could live in peace ever after with his wives and children.

It's also possible that Pratchett later decided he didn't really want to have such a character and that this explains the lack of further mention of him (a 'passive retcon', if you will):

One can't help wondering whether TP would ever have written Tethys into existence by about book 5 - an elemental troll is not really in keeping with Discworld physics and chemistry, and he has never been mentioned since ...

  • Weird, he's Tethis with in I in my copy. Yeah... That's what I was afraid of. Idk about the last paragraph though (though I know you didn't write it) because the trolls we see later on are made of stone which is pretty damn elemental; but also because Tethis is an alien so Disc physics wouldn't really play a huge factor. – Mac Cooper Jan 22 '16 at 7:58

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