Hmmm…This would be a dramatic change.
First of all,the rock-paper-scissors concept,as Metre said,is correct.There are 3 elements basically countering each other right now,under the form of a triangle.
If a fourth element would be implemented,the triangle would become a square.
But a square has something that a triangle doesn’t:diagonals.
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So,as a matter or fact,a square is made of 4 triangles.
That would mean that the countering would work differently as well.
Instead of physical>heat>energy>physical,it would be something like this:
New type>physical>new type>heat>new type>energy>new type>physical.
So,basically it would counter everything and be countered by everything in the same time.That’s unrealistic and too complicated as a basis…
Second of all,a 4th type would most probably require a new bar (beside the hp,heat and energy bars).
That would also complicate things by a long shot…
Third of all,an universal type wouldn’t be all that useful…As they say,a master of all is a master of none.As RiceMech said,it would affect all resistance types,instead of focusing on just one.Like this,straight builds would do a lot more damage from only focusing on one type at a time.
Conclusion:I think it’s better off without a 4th type o’ weapons.
Sorry if anything.I wrote on my phone because I’m currently AFK.