I haven't noticed any references from Harry Potter Jagex uses. The Jagex Basilisk is more in tune with what I considered a basilisk, and the Harry potter basilisk, I consider a big snake with a fancy name. But they both get ideas from the same lore and mythology. Anywhere that uses mythology and medieval style monsters are bound to have some simularities. I've even seen some people wondering why Jagex isn't sued for stealing ideas from Harry Potter and other popular culture things because of using creatures with similar names, etc. But the names and personalities/traits of these creatures have been around for centuries, warped and bent with time. So if someone says Jagex steals the unicorn's healing ability from harry potter (the blood in the HP books, and the horn in runescape), I'd say that Jagex was more true to the lore, since the horns of unicorns are supposed to have healing properties. Or at least that's what norsemen said to europeans when they sold them narwhal tusks. (if you see something that looks like a unicorn horn, it's likely a whale tusk) The ideas of the creatures have been around for a long time. They just haven't been mainstream. Anyways, I'm just randomly babbling.