I've got an idea partially birthed and I need help finishing it. Why would a dragon require a rider with the ability to sense and use magic but other mythological beasts would not? A bit of background: My story focuses on the Beast Riders, a group of fighters who ride mythological beasts such as pegasus, gryphon, hippogriffs, unicorn, and a couple other I've made up. All the Beasts have some sort of magical ability, thanks to the High Magic concentrated in the area where they are born and raised (the Beast Preserve). Most riders do not. High Magic is mostly concentrated in the neighboring country, Esharia. MC's mother was Esharian, with wizarding blood in her family. MC's father comes from the Dragon Bloodline. (something I have to develop further). His great-grandmother was Esharian, and his grandfather the last Rider with a dragon mount. So it is only when the Dragon Bloodline combines with someone who can sense/use High Magic that it is even possible for that person to get a dragon mount. (I'll go into mount selection if you ask, but I'm not going to do it right here bc I don't want to bore you/give info overload) I just need to figure out why.