u/jagexacorn this is absolutely horrifying, disgusting and unacceptable and I will not sleep till this is fixed.
I've spoken to Ash and this was his response: "The developer who wrote GWD seems to have used Aviantese consistently in player-facing text, but 'aviansies' in the code. Slayer unfortunately copies the code version. It's similar to the Dagannoth/Dagganoth or Fremennik/Fremmenik distinctions between player-facing text and the code for a lot of other content. A more interesting debate might be about whether it should be "two bloodveld" of "two bloodvelds"."
And now... I won't be able to sleep thanks all lol!