User blog comment:BannedLagiacrus/Monster Hunter Ecological and Lore Info Blog/@comment-6050823-20150912170645/@comment-5020152-20150912185341

^ Because Alatreon was Armageddon on legs in MH3 and 3U. So far, I don't think any other elder dragon - not even Gogmazios - has been as hard for me to defeat as the five listed above.

(It's also the only one I've defeated. The Fatalises and Miralis are still too tough for me.)