maybe add medal or something instead of soul crystal (put in same slot) to make previous class become "highclass"
-gain stat bonus (maybe not as high as job)
-retain all cross class skill slot (max 10)
-add only 1-2 exclusive skill for that class (job, u get 5 skills) eg. spark - AoE thunder field at floor like flame arrow for highclass THM
-only available at lv 50/45 (depend on how many new skill add)