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Explaining Systems Of league of legends
Seriously, new champs are great, but playing those new champs on the same maps we've all played a hundred times can still get somewhat boring after awhile.
If you go to gank Riven at top and it fails, you did nothing and let the enemy bot lane know they can push hard or zone your bot lane with no worries. A well-placed Petrifying Gaze could turn an entire group fight around.