Can anyone explain gear progression to me for level 100+? I have 3 characters over 100, but I am lost as to what to aim for next. I have sacred items, but I have no idea how I am supposed to get the raw stats in order to equip them. Should I be using Runewords on tier 4 armors with crafted jewels at this stage, honorifics? Is farming Sigs of Learning mandatory for each character before using Sacreds? My characters all wear TU(4) and seem to be stuck

Also confused about the skill Sorc's Ice Elementals, it states Synergies All Sorc Passives...do what? I see the other two skills increase Life and Damage, but what do the sorc passives do for them? Sorry so many questions, kinda noobie at Median.