Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Garen "The Tank"-If you wana be undestroyable, its a good choise to go follow this build.
About items:Mercury's Treads will be better for MAGIC DEMAGE team ofcourse
About skills:In case of you can take on you any DPS spent more skill points to Decisive Strike and max your Courage last one.
Early Game:At 1st lvl you have to hide in grass (with boots it will be easy to be first at the bush) and SB step on it its good to use Judgment and rock the enemy. Its hard to kill anyone before minions spawned with Garen, but with good ally in team its possible.
Late Game:If you alreay have all build's items for Tanking, you're very hard to kill. Just dont rush 1v5 and its shouldn't be problem to stay alive. Remember about Garen's realy big Life Regen. Rather use Ghost to run away, not to kill SB.
Power of Skills:Killing with Garen its easy. 1st use Decisive Strike witch silence enemy, than use, or just Judgment or first turn your Courage ON. If enemy have less than 900HP (lvl 16+) Demancian Justice should kill him without any problems.
ULTI:Demacian Justice - Garen calls upon the might of Demacia to deal a finishing blow to an enemy champion that deals damage based upon how much life his target has missing.
Garen calls upon the might of Demacia to attempt to execute an enemy champion, dealing
1st level: 175 magic demage plus 1 demage for every 3.5 health they are missing.
2nd level: 350 magic demage plus 1 demage for every 3 health they are missing.
3th level: 525 magic damage plus 1 damage for every 2.5 health they are missing.
!ITS BEST WEAPON OF GAREN! *USE IT CAREFULLY*
Sorry For my English ;)