User blog comment:HozzieHozzbourne/Strongest champion outside of the game/@comment-4996845-20130924015228

The extent of power of certain champions is known, since they like to flaunt their perceived omnipotence, like the ones mentioned by the OP and of course the grandmaster at bragging. I'd be more concerned with champions, whose lore is cryptic and doesn't show their power clearly.

Think Brand and Hecarim. Both came to Valoran with less-than-friendly intent, both being proclaimed as possible harbingers of apocalypse. And yet Brand was subdued in the end (by a regular army at that, not a more powerful entity), while Hecarim remains unchecked - and his limits unknown. To that, I'd name Fiddlesticks as my prime contender.

Bearing the title of the first "apocalyptic" champion in the League, Fiddlesticks did nothing more than slaughtering a few summoners - and yet for some reason, he is still one of the few champions that summoners weren't capable of cotrolling after summoning. This could be accounted to the botched ritual or to power of Fiddle himself - take your pick. My guess was: he deserves the title.