Arrow season 3 episode 16: Will Oliver will take up  Ras al Ghul offer
Will Oliver take up Ra's al Ghul's offer and become the leader of League of Assassins?Arrow/Facebook

Arrow's episode 15 promised a cliff-hanger twist and the episode lived up to it.

In Nanda Parbat, Oliver once again escapes death, but this time with a twist. Rather than killing Queen, Ra's al Ghul announces that he wants the archer to replace him as the leader of the League of Assassins.

Meanwhile, Ray finally gets the ATOM suit working and flying, and breaks many an Olicity fan heart by kissing Felicity and sleeping with her.

Episode 16 is titled, The Offer, which will air on 18 March, 2015.

A new promo also teases that the green archer might become the next Ra's al Ghul.

The 30-second video shows Oliver dining with Ra's al Ghul, and a voice-over of the leader of the League of Assassins says, "Oliver Queen is destined to be alone."

He continues, "Your city will turn on you, closest allies will call you a criminal" with scenes of violence in the city, and a fleeting image of Diggle and Roy.

"You will be scorned and hunted, and then killed; I can give you a whole world to save" says Ra's.

The promo also gives fans the first look at Lazarus Pit when the league leader dips his hands in it to heal his cut.

There is more than one path to justice, we hear Oliver say in the promo video, adding, "Maybe I will be Ra's Al Ghul." Besides, the video sports in bold letters the words, "If you could save the world, would you sell your soul?"

Executive producers Andrew Kreisberg and Marc Guggenheim discuss the big choice ahead for Oliver. Oliver is completely taken aback, as he was not expecting Ra's al Ghul's proposal, Kreisberg told Tvline.

"It was something that [executive producer] Greg [Berlanti] and Marc and I talked about: It was important to have a different villain this year and somebody who is going to be doing something completely different."

That Ra's most certainly did, going from "giant, malevolent force" to presenting "the keys to the kingdom to our hero," he added.

How Oliver and everyone else will react to the proposition is also addressed by the producer.

"It makes up the bulk of the next run of episodes," Kreisberg noted, adding that the League is now "a different kind of threat, because they're asking him to join up. [But] as Malcolm tells him in a subsequent episode, [Ra's is] not really asking."

But will Oliver become the next leader of the killer assassins given his humanity?

"Ra's has an interesting perspective on that question, which you'll get in the first act" of the next episode, Guggenheim replied.

"One of the things we reveal in [Episode] 320 is where the name The League of Assassins came from and what it means to be an 'assassin.' If you're a historian, you know it has a different meaning than what it's become in the modern day."

Watch the promo here: