Guild Wars 2

I am confused as why people pick 2 x Superior Rune of the Water and 2 x Major Rune of the Water and 2 x Superior Rune of the Monk. Why not 4 superior rune water and 2 superior rune of the monk?

because u get every boon duration u can, I prefer 2 monk 2 water 2 divinity btw

It’s basically the “boon duration” set, offering you the highest amount of boon duration. Superior Rune of the Water’s 3rd and 4th set bonus do not help with this at all.

2x Major Rune of the Water → +10% boon duration
2x Superior Rune of the Water → +15% boon duration
2x Superior Rune of the Monk → +15% boon duration

Total → +40% boon duration