Janna Smite top is taking over the meta, but it doesn't end there: I spoke to Lourlo (who is climbing the NA ladder rapidly with the strategy) about how it's evolving to
Janna Support Build, Runes, Counters (Patch 13.11) - OP.GG - League of Legends
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League of Legends S12: Janna Support Build Guide - Millenium