so here's figured out on equip stars so far:
4G equips (this might change as kTO doesn't have gacha, so they don't have 4G, so this might just be VIP shop equips)
Boss set equips
Area exchange equips
Also I have seen a wondrously beautiful thing, the item girl star card, which for those that don't know is the grade 8 rfit star card and is 30%. I also saw the grade 8 drop rate star card which is 40%. 90% refine rate boost and 120% drop rate, wish I knew how they got them.