A new race – the Order of Knights of Elrath.

No, no, no need for a hippogriff! Hippogriffs are unnecessary! The Marshal should be on a horse, and eagles will suffice.

You might be right. After all, the Haven faction also has only one creature – the griffin, and why not limit it to one representative of our smaller brethren here as well.

Added 6 minutes later

Haven already has a horse, and the whole point of the 5 heroes is different types of transport! A hippogriff is needed!

This race can be called an analogue of Haven. Let there be a horse.