The Icelandic side, who qualified as Group Three winners, raced into a 6-0 half-time lead after goals from Svava Gudmundsdottir (2), Rakel Hönnudottir (2), Fanndis Fridriksdottir and Berglind Thorvaldsdottir.
Malfridur Sigurdardottir and Esther Arnarsdottir both scored late on.
Met finished third behind runners-up Spartak Subotica, who beat them 3-2.
The Welsh side began their campaign with a 4-0 win over NSA Sofia.

The 51-year-old is in the town performing as Baron Hardup in the pantomime Cinderella.
Tweeting about being stopped by North Wales Police officers on Sunday night, he said: "Randomly stopped for breathalyser test, had a laugh, made some new friends! Safe, clean town, love it!"
Osmond passed the test - oh yes he did!

Tony Lloyd was responding to the UK Statistics Authority's findings that policing faces a £160m real-term cut in funding in 2015-16 and 2016-17.
The figures are in apparent contrast to Mr Osborne's Spending Review pledge.
A spokesman for the Treasury said they "completely reject any suggestion the public had been misled".
Mr Lloyd, who is also Greater Manchester's police and crime commissioner, said the Authority's findings had called the chancellor's promise into question.
He said: "This analysis exposes the weakness of the chancellor's pledge to protect local policing, after years of cuts, and is an embarrassment for him and the government.
"I have said from the start that this is still a 'cuts budget'. This year we face a cut of £8.5m cut from our budget. That's on top of the £180m already cut from GMP and the 2,000 police officers that have disappeared from our streets.
"To try and make the sums add up I have had no choice but to ask local people to contribute more to maintain their police service, but the additional £3.5m raised from council tax is still not enough to meet the shortfall as we try and find savings of £70m.
"The Chancellor needs to redo his sums and make good on his promise protect our police service."
The Treasury said the widely reported comments by Sir Andrew Dilnot, the chairman of the UK Statistics Authority, do not provide the full picture and exclude elements such as the police precept.
A spokesman said: "The government has been completely clear that we are committed to funding the forces that keep our country safe, which is why we have protected overall police spending in real terms with an increase of £900m cash by 2019-20 to maintain strong frontline policing.
"This is on top of an extra £500 million extra funding for the counter terrorism budget."

Kostadin Kostov told Exeter Crown Court he was not angry when Gergana Prodanova started a relationship with fellow Bulgarian Tihomir Todorov.
Mr Kostov is accused of dragging his ex-partner's body through Exeter city centre in a suitcase in August 2016.
The 43-year-old, of Mount Pleasant Road, Exeter, has said he has no idea what happened to Ms Prodanova.
Ms Prodanova left Mr Kostov and their three children in Bulgaria when she moved to Exeter in December 2015.
Mr Kostov followed three months later, by which time she was working at the Great Western Hotel and was in a relationship with Mr Todorov.
He said he is not the man seen on CCTV trailing a heavy-wheeled suitcase towards the railway line on the morning of 7 August and returning a few minutes later without it.
He told the court: "I felt, with Gergana, it was over and done with. I accepted her relationship with Mr Todorov."
The trial continues.
Cardiff Met missed out on place in the Uefa Women's Champions League knock-out stages after defeat by Breidablik.
[NEXT_CONCEPT]
American singer Jimmy Osmond has posted a video of himself being breathalysed by police officers in Llandudno.
[NEXT_CONCEPT]
Greater Manchester's mayor has called for Chancellor George Osborne to apologise for "wrongly claiming there would be no cuts to local policing".
[NEXT_CONCEPT]
A cleaner who denies murdering his ex-girlfriend said he was not jealous when she left him for another man.