Gathering Storm: permanent stat increase or persistent buff that increases?
How exactly does the new rune Gathering Storm work?
Suppose it's a 30+minute game.
Does Gathering Storm give you a permanent stat increase of +6 AD at 10 minutes, a further +18 AD at 20 minutes, and then another +36 AD at 30 minutes for a total of +60 AD?
Or does it give you a persistent buff that increases from +6 AD to +18 AD to +36 AD every ten minutes?