A simple demonstration on how to use it, first make a Lua, or use a pre-existing Lua.
Then add,
if not SPECRPG then return end
charstats["skinname"] = {HP, ATK, DEF}
levelupstats["skinname"] = {HP, ATK, DEF}
charstats are your base stats upon entering a dungeon, levelupstats are your stat increases per level.
levelupstats are multiplied by what level you just turned.