one of the best things is the Biotics, that's our characters with suits similar to Ironman haha, well no, we can really control the dark energy, not everyone can control it so I hope you understand that from that part.
I love being able to get all nerdy xD
Biotics don't really control dark energy, rather they have something called Element Zero infused in their bodies which allows them to create mass effect fields. Being biotic, for the most part, comes with being exposed to Element Zero.
All Asari are born with this ability, but humans are not. In fact there was a lot of testing that happened with Element Zero on pregnant women.
Humans who are biotics also get brain implants that can help them control the abilities and enhance them.
Asari however do not need these implants.
Hahahahahaha, yeah, you're right, I played this quite a few years ago and maybe I got confused, but that doesn't take away from the fact that being biotic is awesome, lol, it's a unique breed!