should be a lower difficulty level in my opinion

Quite good but I prefer puzzel rather than knowledge based questions in fiendish

Quality 1, difficulty 5. Mr Johnson you really should have better things to do with your time.

Contrary to other commenters, I think this is pretty brill (though had me stumped to complete most of the groups, save for the spiders). It is fairly dependent on having broad literary/story knowledge, though.

I loved this puzzle! It did a really good job of mixing up genres (from classics, cartoons, etc.) so that you had to think more deeply about the connections beyond the immediate associations of the clues. Especially liked the animals + spiders clues.
PS I think some of the other commenters here are right spoilsports. This wasn't any more knowledge-based than other ones on this site. And "you really should have better things to do with your time" coming from someone who apparently spends their time making rude comments on people who have made them puzzles for free?! ffs

I don't think Nagini was cursed. Also "Demigods" would also fit for the Son of Poseidon one