I think each weapon type for King have difference attack speed rate, such as Hammer attack slower than sword.
With this, may be there aren’t problem to add new type of weapon?
Bow may have pierce at primary attack type which bring good and bad to our King, good points are having range attack and win against some troop, bad points are dealing low damage to tower even can’t attack spike trap.
And I suggest “Staff” which deal area damage but very slow at attack rate.
For new element I think it isn’t really necessary for the present.
'cause what’s it for? Lightning Element have effect that stun troops and tower for a sec?
But who are resist or weak for that element?
Also with that will bring great problem to adjust balance for the game, only King can use that element isn’t good.
On the other hand, if new Troops and Towers type appear, it will be good idea.