Serial Europa League winner Unai Emery guided Arsenal to their first final in the rebranded competition with a 6-3 aggregate victory over Valencia.
The Gunners went into the semi-final second leg with a two goal buffer from the first match at the Emirates, where they ran out 3-1 winners.
But Emery's men found themselves trailing on the night after just 11 minutes when Kevin Gameiro fired past Petr Cech to put the La Liga outfit ahead.
Pierre-Emerick Aubameyang drew the scores level just six minutes later before Alexandre Lacazette put the Gunners ahead after the break. Valencia refused to go down without a fight and levelled the match once more through Gameiro.
But hat-trick hero Aubameyang had the final say to ensure Arsenal ran out 4-2 winners on the night to book their place in the final in Azerbaijan.
Here's how our man Neil McLeman rated the performances from the Mestalla Stadium.

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Arsenal
Cech 7
His final Arsenal game will be against Chelsea in Baku
Sokratis 5
The Greek defender was repeatedly targetted on the counter-attack
Koscielny 8
Arsenal's best defender after suffering serious injury in last year's semi
Monreal 7
Quietly effective display on the left-side of back three
Maitland-Niles 7
Caught out up field for Gameiro's goal. Tireless running
Torreira 7
Ran and harried all game and used possession simply and well

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Xhaka 7
Increasingly influential in the Arsenal midfield. Disciplined performance (for him)
Kolasinac 7
Good contest down the left with Daniel Wass. As ever, better going forward
Ozil 7
Had the calm and the class to slow the game down
Lacazette 7
Assist for Aubameyang opener. Hit post. Scored winner.
Aubameyang 8
Superb finish and set up Lacazette chance with brilliant run
Subs: Mkhitaryan/Ozil 62
Unused subs: Leno, Elneny, Iwobi, Mustafi, Guendouzi, Nketiah

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Ref: Danny Makkelie (NL)
Att: 44,481
Valencia: Neto 6; Garay 5, Piccini 6 (Soler, 56,5); Gabriel 6, Gaya 6; Wass 6, Parejo 7,Coquelin 6, Guedes 7, Gameiro 8, Rodrigo 6
Unused subs: Domenech, Roncaglia, Diakhaby, Lato, Torres, Mina