Five Ex-Bioware Devs Talk About Mass Effect 3's Ending

The ending relies on space magic, and the lead writer, lead gameplay designer, and executive producer all just embraced that and owned it from the get-go,” Hepler tells me. “‘Any sufficiently advanced technology’ and all that. They wanted and got a really big decision that affects the whole galaxy. If you give it a moment's thought, none of the three options are perfectly moral or the ‘right’ answer for everyone. Destroy may not solve the problem of AI and organics; Control rewards the Reapers; even Synthesis, which is harder to get than the other two and sounds like it'd be permanent peace, basically violates the entire galaxy's bodily autonomy without consent. So that part, I think, works.

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“Now, what would I have done?” Hepler asks. “I wouldn't have done space magic at all. I planned to write three Codex entries on the Crucible rather than one, reflecting on what scientists think it is at first, what it appears to be once construction has really made progress, and a third detailing how it will kill the Reapers, readable right before you return to Earth.”



Hepler explains that he wanted to take inspiration from Nancy Kress’ novel, Probability Moon, in order to have the Crucible use the strong nuclear force as a weapon. Kress’ superweapon is designed to create a massive burst of energy that is completely harmless for objects that have a low atomic weight, like organic flesh made of carbon chains. This means that the vast majority of Citadel species would be virtually unaffected by a blast from this weapon.



Objects with a much higher atomic number, however, would be annihilated by the pulse. This weapon is constructed in such a way that it emits life-killing radiation for anything made up of heavy metals. “So cybernetic creatures like the Reapers and husks would have their organic parts fried because they're right next to the heavy metals, but the organic creatures a safe distance away, like a civilian population, would be just fine,” Hepler says. He also notes that there is room for casualties here - if organics were on hi-tech spaceships, for example, they could get caught in the blast radius due to their current surroundings, meaning space navies would also be at risk.

“The rebuilt Shepard, who had a fair bit of cybernetics, would die heroically, but that was always likely to be on the cards. In talking with Ann Lemay, another writer on the project, we theorized that the metal most likely to be the atomic weight cut-off-point was niobium, which today is used in piercings and surgical implants because it doesn't rust and you can embed it in flesh without ill effects. It's even blue when exposed to oxygen, like the glowing blue husks we've been fighting since [the first] Mass Effect. So it would make sense as a building block for the Reapers and their ultimate weakness.”

Hepler explains that fans had observed several hints throughout the trilogy that pointed in completely different directions. For example, there are aspects of the lore that actually lean towards the Citadel species allying with the Reapers in order to collectively tackle a dark energy anomaly, as opposed to the Reapers remaining as the Big Bad right up until credits roll. Hepler confirms that there are explicit lore details that lean into this idea, but that he never personally heard about capitalizing on them. Remember, this is coming from the Mass Effect loremaster - if he says there is lore to back up a dark energy anomaly that only the Reapers can save us from, it certainly exists.