(I haven't tested this, only heard it when asking about it)
Apparently magic just doesn't do anything to Kree'arra, can we have it so it does?
From the Osrs Wiki:
As Kree'arra is airborne, regular Melee attacks will not work; instead, Ranged or Magic must be used to fight him. A salamander is the only melee option.
Osrs has it, Runex should defo have it, too
(If it turns out I was wrong and you can attack Kree with mage then you're free to call me names, mybad)