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Originally Posted by TheLastBaron88
Merc Treads dont prevent stuns, they reduce their duration. By seconds, or more commonly fractions of seconds. Garen is tanky enough to last a second or two without attacking, and besides, he basically deals burst anyway.
Garen has two forms of burst, his Q and his R, and the only one he leads with under normal circumstances will be his Q. Much of his damage comes from his E which is sustained damage, and if you're rooted/stunned for most of the duration it's a serious drop in damage output.
Garen already has a nice MS steroid in his Q and will often build a FoN. He's doing fine for speed. Tenacity doesn't fit anywhere else into his build. Merc Treads is definitely ideal unless you're playing against a low CC team.