Too powerful, too composed and ultimately too clinical, Toulouse gradually wore down Montpellier's resistance in a final that was effectively decided before half-time.
Toulouse arrived at the Stade de France as overwhelming favourites after dismantling Racing 92 in the semi-finals, but Montpellier travelled to Paris with reason for optimism, having won 23 of their previous 26 matches in all competitions.
Any hopes of an upset were quickly undermined.
Following a lengthy pre-match ceremony, the contest burst into life with a ferocious battle at the breakdown. The opening try came after just six minutes, when hooker Peato Mauvaka burst clear from a cleverly worked lineout, leaving Donovan Taofifenua trailing in his wake before sprinting 50 metres to score.
Montpellier's miserable start worsened when hooker Jordan Uelese was forced off injured, while two promising attacking opportunities went begging. Opting for the corner rather than three straightforward points backfired as Toulouse stole the lineout, and a well-worked move was later ruled out after an obstruction.
Despite struggling to find their usual attacking fluency, Toulouse remained in control. Domingo Miotti finally opened Montpellier's account with a penalty in the 24th minute, only for Romain Ntamack to restore the advantage almost immediately.
The defending champions then shifted through the gears.
A slick inside pass from Emmanuel Meafou almost released Matthis Lebel before Antoine Dupont was denied near the line, but sustained pressure eventually told as Mauvaka crashed over for his second try from close range.
There was still time before the interval for Blair Kinghorn and Teddy Thomas to carve open the Montpellier defence, with Dupont perfectly placed to finish the move and give Toulouse a commanding 25-6 lead at the break.
At that stage, the destination of the Brennus Shield already looked beyond doubt.
Montpellier rally falls short
Heavy rain greeted the second half, and Montpellier briefly threatened an unlikely comeback. Gabriel Ngandebe sliced through the Toulouse defence before replacement Justo Piccardo crossed beneath the posts less than two minutes after coming on.
A scrappy passage of play then saw Lebel shown a yellow card, but Jack Willis produced another crucial turnover to blunt Montpellier's momentum.
The game briefly descended into an open, chaotic contest, but that suited Toulouse perfectly. Even with 14 men, they controlled possession, slowed the tempo and stretched their lead back to 15 points with a penalty.
Play was then suspended for around 10 minutes as a thunderstorm swept across the stadium.
When the match resumed, Montpellier threw everything at Toulouse. A dominant scrum earned them a five-metre attacking platform, only for a costly knock-on to squander the chance. Léo Coly later darted over from close range to reduce the deficit to eight points and inject late tension into the final.
But Toulouse never lost their composure.
They monopolised possession when it mattered most and expertly managed the closing stages, while Montpellier's final opportunity evaporated after an overambitious decision to target the back of the lineout from a late attacking penalty.
It was a fitting summary of their evening: plenty of endeavour, but not enough precision.
The final score of 28-20 reflected Toulouse's superiority. More disciplined, more efficient and tactically sharper throughout, Ugo Mola's side claimed a fourth straight Top 14 title and further cemented their remarkable grip on French domestic rugby.