Make them a level 50 dungeon where they are the last boss.
Make them a guild hest
Make them a trial like the primal.
BUT FFS remove them as fates. Its bad enough that if i want to do them on my main i have to wait 10 minutes just to see their body appear becacuse every living soul on the server happens to be standing in the area, but if they happen to spawn in the level 20-30 zone while im gathering i get error 90000 for 20-30minutes until they kill the damn guy.
HE IS A TERRIBLE DESIGN. you know your servers cant handle stress, you know your zones cant handle stress. EVERYONE who is a final fantasy fan wants to kill ODIN and Behemoth at least once in their career. THey cant be fates.
Not only that, they arent given their proper respect as a fate, what if titan was a fate, he would be a complete joke, because no matter how hard you make a boss, that is trumped by 300 players attacking it at once with infinite option to rez and run back.