MY DUDES I JUST REALIZED SOMETHING!!!!!
So I started a new character in Minecraft Dungeons (I).
I was at Creeper Woods, fighting the Spiked Eye, because the Endersent side quest is really damn cool.
And I was using the first artifact, Fireworks Arrow.
So, I shot the Spiked Eye, and realized that if you shoot a fireworks arrow, the Thorns enchantment doesn't register the huge damage! It just thinks I shot a normal arrow!
So, I found out that Fireworks Arrow bypasses the Thorns enchantment.