You might think that this build looks a bit troll, but it's really FUCKING good.
The thought behind it is stacking as much magic penetration as humanly fucking possible so your ultimate does true damage to every single faggot on the enemy team. I mean look at this motherfucker
R: Demacian Justice
Garen calls upon the might of Demacia to attempt to execute an enemy champion, dealing 175 / 350 / 525 damage plus 1 damage for every 3.5 / 3 / 2.5 health they are missing.
Cooldown 140 / 120 / 100 / 0seconds
HOLY FUCKING SHIT!
With enough magic penetration on this bad boy and maximum CDR you'll end even losing games with atleast two-digit kills and zero assists+deaths assuming that you don't fuck up like a wheelchair racer.