Tammy Abraham was the hero in the shootout as Aston Villa beat West Brom 4-3 on penalties after a tense 2-2 battle at The Hawthorns.
The on-loan Chelsea striker slotted home after the two sides could not be separated after 180 minutes of play and extra-time.
Craig Dawson headed home the only goal on the night which forced extra-time after the 2-1 result in the first leg.
But West Brom's task was made even more difficult when Chris Brunt saw red late on for two bookable offences 10 minutes before the end.
The game went to extra time and then penalties after a heroic defensive effort from the hosts.
Just like the first leg, the atmosphere was electric inside The Hawthorns to truly mark the occasion of a derby in a play-off semi-final.
The action on the football pitch failed to match up for the opening 20 minutes or so, with both sides matching each other in the midfield.
Out of nowhere, West Brom found the goal they desperately needed on the half-hour mark. A long throw came in from Brunt and Dawson arrived to glance his header in off the far post.
On the stroke of half-time, Brunt was fortunate to escape punishment after appearing to stamp on John McGinn's hand. Referee Chris Kavanagh opted against handing out a card, to the fury of the Aston Villa bench.
After the interval, the Baggies had a number of chances to extend their lead. Goalkeeper Jed Steer gave away possession and Jacob Murphy's curled effort was cleared off the line by Tyrone Mings, saving a certain goal which could have buried the visitors.
Having been booked for another poor challenge on McGinn, Brunt received the red card he perhaps deserved earlier in the game after a rash challenge on Jack Grealish.
From there, Villa finished the stronger of the two sides with an extra man and only a fine stop from Sam Johnstone denied substitute Albert Adomah.
Extra time arrived and so did Jonathan Kodjia from the bench as Villa went for the jugular, with the hosts camped on the edge of their own box.
Despite dominating possession, the likes of Grealish and Adomah saw their chances go begging as the Baggies held on for a penalty shootout.
After Jed Steer saved two spot-kicks in the shootout, it was up to Tammy Abraham to seal it and he slotted past Johnstone to send Villa to Wembley.
