imo...with references to all map throughout arlor...there'll be fire(tindirin), water,(zodias),ice/frost(nordr), dark&light(chancel of light)...idk which map represent earth,....glintsone?

But four most common elements will be fire,water,earth and wind.
Other elements is light,void,normal(cant be affected by any elements).

So, i guess it'll be hard for sts team to introduce elemental damage/defences if it affect all equipment existed before expansion level 86.
If elemental damage/defences only applied to equipment after level 86, it'll be easy but at cost of previous equipment having no elements except weapon like igneath, highfrost...