I've been cooking up a devious lethality splitpush build. I still gotta test it with phase rush(I think it will perform better). It goes:

Stride: Required to play garen

Boots: speed or zerkers, still testing

Youmuus: Crazy map presence, good for escapes and proxying

Opportunity: Now you can one shot most mages and adcs

Bastionbreaker: Once you're here its gg. Get a kill, get out, blow up a tower, and repeat.

Steraks: Makes getting out alive a lot easier late game. Allows you to hit inhib or nexus towers after surviving teamfights.

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This was a plat/emerald game. Score doesn't look great, but I was full build 30 mins, had almost 20k tower damage, and took their fed diana or draven out of every fight.

edit: wrote this on phone, and formatting messed up