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Thunderstorms reverberated around the King Power Stadium and this was a deafening statement from the Premier League champions.
Leicester's miracle men are up and running with their first victory of the season, Jamie Vardy scoring his 50th goal in league football as Swansea were blown away in the torrential rain.
This was a return to the verve and vigour of last season's title triumph, with Wes Morgan adding a second and Riyad Mahrez missing a penalty, and offered a hint that the Leicester rollercoaster is not grinding to a halt any time soon.
Swansea were as abysmal as the weather, fortunate to escape without a more humiliating scoreline and only impressing in the final 10 minutes, but this was the perfect end to a memorable week for Claudio Ranieri and his players. It was also Ranieri's 100th Premier League win as a manager.
The only concern for Leicester was the early departure of goalkeeper Kasper Schmeichel early in the second half, with the Denmark international to undergo a hernia operation tomorrow.
But nothing was going to rain on this Leicester parade. "I hope to make another hundred wins," said Ranieri. "It's important because also three matches, one loss, one draw, one win. It's good because after the international break there is another tough match against Liverpool.
'The goalscorer always scores goals and I'm very happy for Jamie. Of course some season a little more, some season a little less, but the goalscorer never forgets the way. Of course it's important to score a goal for strikers because it's their life. I think the first half was outstanding for us and we have to score one more goal.
"After we missed a penalty maybe the opponent got more confident and we complicate a little our life. It was tough. The rain was unbelievable. It was water polo."
Leicester's world has transformed dramatically over the past 12 months and the Champions League draw was a moment to savour. Away from the razzmatazz of next month's European adventure, Leicester's start to the campaign has been a slow-burner, yet this was embarrassingly one-sided from the first whistle.
Swansea have games coming up against Chelsea, Manchester City, Liverpool and Arsenal in the league and this performance will have done little to encourage head coach Francesco Guidolin.
A goal was inevitable and it finally came in the 32nd minute from a familiar source to last season. Danny Drinkwater's lofted pass sent Vardy clear and he raced past Jordi Amat to fire in off the post. It was Vardy's first goal of the season and reward for Leicester's total dominance as a thunderstorm boomed around the King Power Stadium.
Leicester recorded seven goals without reply against Swansea last season and were looking in the mood for another rout, with Shinji Okazaki testing Lukasz Fabianski from distance before half-time.
It was Morgan who extended the home team's lead eight minutes into the second period, taking full advantage of sleepy Swansea defending to lash the loose ball home.
The sense of total disarray from Swansea increased in the 56th minute when Amat recklessly brought Okazaki down in the area, but this time they escaped after Fabianski pushed away Mahrez's tame penalty.
"I am very disappointed because he is a very good lad," said Ranieri. "They are two, him and Vardy, and he wanted to shoot. It's OK for me. Now I speak with both lads."
Swansea did respond nine minutes from time, with Leroy Fer heading in past substitute goalkeeper Ron-Robert Zieler, with Schmeichel off injured. And there were some nervy moments for Leicester as the rain hammered down, but they had done enough to achieve lift-off.
Guidolin said: "I was worried in the first half. I had to have a meeting with my players at half-time to tell them that the game was not over. Leicester played very well, they were strong like last season. We played with more courage and intensity in the second half but Leicester deserved it."