When Viego places barrels after possessing Gangplank, he is still able to detonate them even after the possession ends (You can see this in the video). This means champions other than Gangplank, such as Viego-turned-Jhin, can now explode barrels. Excluding infinite scaling via sources like Nasus Q or Gathering Storm, I believe this is the most damage a barrel will be able to do as of the release of Viego.
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