I like to beg to differ on the changing of the base class suit the role of a job. The lancer wouldn't need changes the soul crystals would add a system of top of the existing moves similar to warrior with wrath and a stance. The class already has a parry buff so building off parry and maybe a counter attack system could change the whole playstyle but never need to change lancer as a whole. Now the skill would be piercing and your auto attack would be slashing i suppose which won't really matter. So I guess the only issue would be what to do with the crystal to weapon equip. Sam would need to be able to equip at least one spear or change the system to force a crystal equip on weapon change. All small problems. I think the big issue would be to make the system interesting and balanced with pld and war would be the issue more so then making a dps interesting.