West Coast forward Josh Kennedy booted four goals and Nic Naitanui weaved his magic in the ruck to help lift the Eagles to a 55-point AFL elimination final win over Essendon at Optus Stadium on Thursday night.
Kennedy booted three first-half goals and set up two for Liam Ryan to blow the game open early.
Naitanui, playing his first game since suffering a syndesmosis injury eight weeks ago, produced a series of potent ruck taps and crunching tackles to give his side the midfield ascendancy.
West Coast opened up a 41-point lead midway through the second quarter, and were able to withstand two Essendon fightbacks to secure the 17.14 (116) to 9.7 (61) win in front of 59,216 fans.
The Eagles will now take on either Geelong or Collingwood at the MCG on Friday week in a semi-final blockbuster.
Naitanui finished with 24 hitouts and 14 disposals in a promising return.
But the 2012 All-Australian was reported for shoving Zach Merrett into the fence after the Bombers midfielder tugged on one of his dreadlocks.
The angry exchange sparked a heated melee, and Merrett was reported for the original hair tug.
But both Merrett and Naitanui will probably escape with a fine given there were no injuries to come out of it.
Naitanui showcased his speed at ground level during the match, running down Bombers speedster Adam Saad in a mad dash in which he reached a speed of 31.7km/h.
Essendon haven't won a final since 2004, and the big question now is whether coach John Worsfold will hold onto his position.
Rumours have bubbled in recent weeks that Worsfold could be axed if he failed to guide his team to a finals win, but the veteran coach is confident he will be at the helm in 2020.
Eagles forward Jamie Cripps booted four goals and Liam Ryan kicked three in a strong display.
Essendon forward Jake Stringer was goalless, while Saad shook off a close tag from Mark Hutchings to finish with two goals and provide some good bounce from defence.
The Bombers booted two of the first three goals of the match, but the rest of the quarter belonged to West Coast as the club's indigenous stars came to the fore.
Lewis Jetta's pin-point kicks from defence were complemented by magical play from Ryan and Willie Rioli further up the field.
Kennedy booted his second goal on the quarter-time siren to give West Coast a handy 21-point lead at the first break, and the margin swelled to 41 points midway through the second quarter.
Saad sparked a mini revival for the Bombers to help close the margin to 30 points at the long break.
Merrett's tug on Naitanui's dreadlock ignited an angry response as tempers threatened to boil over in the third quarter.
Essendon booted the next two goals to close the gap to 24 points, but the Eagles were able to hold their nerve and then pull away in the final quarter.
The Bombers lost Mitch Brown to a calf injury in the third quarter.