Scoot over Jackie Olivas. Useless posts to every item you comment on by calling it a wet dream. You're setting back the women's movement back several years and you're making females in our U.S. Armed Forces look bad.
Anywho... Some information has finally been posted on Wiki as far as obtaining the 90 version of G.horn.
Defeat Goblin Golem 3 times. Zone boss for Dynamis - Jeuno.
Defeat Tzee Xicu Idol 3 times. Zone boss for Dynamis - Windurst.
Defeat Quiebitiel 5 times. Attestation boss for Mandau/Mjollnir/Gjallarhorn.
Pretty interesting path compared to the relic weapons, considering in order to do the weapon trials, they mainly involve using the associated weapon skill and they don't involve returning to Dynamis until later on.