I think I lost what just happened and need some advice or explanation. I read where they said ilvl 70 gear would be adjusted when converting to Tier IV mats.

What does this mean when trying to get a tier iv materia?

Will ilvl90 gear be 100%? As far as I know ilvl70 and ilvl90 gear was the only 2 kinds you could craft, spiritbond, and then get a tier iv materia from. With everyone working on novus and tier 4 mats already high for some of them, How do we go about getting our tier iv mats efficiently without wasting a bunch of time?

I think I feel little lost on what path to take now. Can someone please help me out?