I do remember them saying that Louisoix's Staff is very important horn that has been passed around for for many generations. That it wasthe "key" to something. I think it played a minor role in 1.0
Not only doe the staff hold great power its also a relic of Louisoix, so it might've had a boost in power since that "incident"
I wonder if the Asciens plan on summoning Zodiark (or another entity, maybe Hydeline?) via the 6 crystals we collected in 2.0 + Lousoix Staff + Minfilia (who seems to have the strongest connection to Hydeline next to the hero) = ???
Lastly, Hydeline has been pouring her essence into the Hero constantly while her power dwindles what if they plan on taking this "essence" from the Hero; hence the beam of light puncturing the Hero
