The win makes them the most successful English side ever in Europe, busting open the door to that pantheon with a display of zeal and power, unbeaten across the tournament and unbowed at the final whistle. Saracens had the muscle, pounding Leinster until they cracked, a hit-job of clinical proportions.
Here, we take a look at the big questions behind this epic match-up ahead of the game. Who are the key players?
With five likely starters all being nominated for the ECPR European Player of the Year award, it will be interesting to see who makes the most of their opportunity on the big stage.
How about the coaches? They might just be one of the best club sides around these days, and McCall can certainly take a lot of the credit for their recent success. Now in his tenth season, Saracens finished ninth in the league before he took over.
Does their current form give any indicators? After topping their group with six wins out of six, they breezed past Glasgow Warriors in the quarters, before toppling Munster in the semis.
Meanwhile, Leinster lost one of their group games before scraping through with the narrowest of quarter-final wins in an all-Irish affair against Ulster, where they won , before securing a more straightforward win against Toulouse in the semis. What about their past fixtures?
Saracens take on Gloucester Rugby in a bid to reach their fifth Premiership Rugby final in six years.
But Leinster will also be well aware that they are on the brink of joining their coach in the Champions Cup history books. If they do, it will be for a record fifth time, more than any other club has managed.