Brian O'Driscoll claims one of seven Leinster tries against the Scarlets
Heineken Cup finalists Leinster proved their pedigree with a blistering seven-try hammering of the Scarlets.
The defeat was a significant blow to the Welsh side's hopes of automatic qualification to next season's European showpiece tournament.
Wings Luke Fitzgerald and Shane Horgan each claimed a brace, while Brian O'Driscoll, Jonathan Sexton and Girvan Dempsey also crossed.
Mark Jones touched down the hapless visitors' sole try.
The heroes of Leinster's Heineken Cup semi-final win over Munster started the game en masse and after weathering a spirited opening from the visitors built an early lead in their final home game of the season.
Davies ponders Scarlets' coaches' future
That lead was built on the Scarlets' ongoing scrum troubles and Leinster's confident set-piece plays that made a mockery of the visitors' defence.
The Scarlets showed some good touches of their own in those opening stages, providing evidence they have the ability to trouble the best of teams when on the front foot.
However, with a relative lack of possession Nigel Davies' side could but admire the manner in which Leinster ruthlessly exploited their superiority over the visitors.
After Sexton hit an upright with his first penalty shot at goal, the outstanding young prospect's slick distribution was on target to help launch the move that ended with the game's opening try.
Davies disappointed with 'leaked' tries
Left wing Fitzgerald was on the end of it following Isa Nacewa's contribution and Sexton's conversion was swiftly followed by another.
This time Nacewa was again involved, scything through to send right wing Horgan away.
Sexton again converted the 19th-minute try, but was kicking his heels in the sin-bin seven minutes later after kicking the ball away following his try-saving tackle on Jonathan Davies.
In the meantime full-back Daniel Evans opened the Scarlets scoring with a penalty and when hooker Bernard Jackman fumbled a pass, Jones sped to the corner to give the visitors hope.
But with the last move of the opening period, the Scarlets fell behind once more, this time with O'Driscoll's final pass rewarding Fitzgerald's acute angled run and Sexton converted for Leinster to lead 21-8 at the break.
Six minutes into the second half O'Driscoll turned from giver to taker, out-pacing Stephen Jones on an arcing run for the bonus-point try and Sexton again converted.
Sexton added the fifth, throwing dummies for fun before racing in from 40 metres and adding the conversion.
Horgan was next to score, followed by Girvan Dempsey after the wing kicked ahead, Sexton failing to convert either of those scores.
But that was of little consolation to Scarlets boss Davies and his assistant Paul Moriarty who could be seen holding their heads in their hands at the horrors that unfolded before them.
Leinster and Lions wing Luke Fitzgerald: "It was a pleasing enough performance given it was the last one in front of the crowd at home this season.
"The Scarlets are always tough opposition so to post the score that we did was very pleasing.
"It was an easy enough game to get up for because we've had some great battles down the years with the Scarlets.
"They beat us very well in Dublin last season so we kind of had a bit of a point to prove."
Scarlets boss Nigel Davies: "It was extremely disappointing, obviously. We just leaked so many easy tries from first-phase defence, it's unacceptable. Very disappointing.
"We've just got to put this behind us very quickly. We've got to keep our heads up. We've got two big games coming up and this cannot affect the boys.
"And I've said that to the players after the game. What they've got to do is react professionally.
"They've got to make sure that the rehab is done properly so that when they come back to work on Sunday they are ready to go again."
Leinster: Nacewa; Horgan, O'Driscoll, D'Arcy, Fitzgerald; Sexton, Whitaker; Healy, Jackman, Wright, Cullen (capt), O'Kelly, O'Brien, Jennings, Heaslip. Replacements: Dempsey for Nacewa (48), McFadden for O'Driscoll (63), S Keogh for Whitaker (63), McCormack for Healy (63), Fogarty for Jackman (53), Toner for Cullen (41), S Keogh for Jennings (58).
Scarlets: D Evans; M Jones, G Evans, Davies, Williams; S Jones (capt), M Roberts; I Thomas, Rees, John, Cooper, Day, Turnbull, Edwards, Lyons. Replacements: Priestland for M. Jones (53), Higgitt for S. Jones (59), Cattle for M. Roberts (69), Owen for Rees (59), Manu for John (32), Reed for Cooper (63), McCusker for Turnbull (53).
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