Garen has been using Targonian power???
Garen's sword is blessed by Kayle, and Kayle is the child of aspect of justice, so Garen's sword has targonian magic? https://www.reddit.com/r/leagueoflegends/comments/ayfxhw/were_the_rioters_that_reworked_kayle_and_morgana/
It says targon related.
: "Ignorant of the very magic you carry into battle. How Demacian."