St Pat's Maghera are through to a third Hogan Cup final in four years after a dramatic 2-14 to 3-10 win over Connacht side Summerhill on Wednesday.
Despite influential captain Conor Glass being unable to start, the MacRory Cup champions led 1-8 to 1-4 at half time.
However a superb display by Sligo senior Kyle Cawley had Summerhill three points up in Brewster Park.
There was late drama as a last gasp penalty and winning point from McGuigan put St Pat's through in Enniskillen.
Shane McGuigan, who finished with a total of 1-8, scored a first-half goal to put the Derry side 1-3 to 0-1 up.
They led by seven points before Cawley's first goal brought Summerhill back to within two points, but they trailed by four points at the interval.
Shane McGuigan scored two quickfire points to put St Pat's in control but Summerhill hit back again when Cathal Herron drilled home the rebound after Cawley's shot was saved.
In an exciting finish, Cawley converted a retaken penalty to put his side in front and they led by two as the game entered stoppage time.
St Pat's, who introduced the injured AFL-bound Glass with a few minutes remaining, were awarded a penalty after a foul in the square on McGuigan and Francis Kearney smashed it in off the post before McGuigan kicked the winning score.
The Derry champions will now face St Brendan's, Killarney in the final in Croke Park chasing a sixth Hogan Cup, which they last won in 2013.