system
Given the following post, respond as if you're commenting on Reddit:
human
[Mass Effect] How does the Mass Effect field work?

I have heard of other Humans who get biotic implants and being able to do pretty amazing things using the Mass Effect. How do they control it and why do they have a reputation to go crazy?
gpt
Mass Effect Fields are the product of Element Zero, which is basically what it sounds like... It's 0 on the Periodic Table. It's a semi-unstable material which naturally has no mass or charge (and thus doesn't typically react to surrounding elements) but when you run an electrical current through it generates a spatial distortion that can be further manipulated (through variations in current) to increase or decrease mass within the distortions radius.

Biotics are individuals who have trace amounts of Element Zero in their systems. This reacts with the biological functions by creating minute Mass Effect Fields charged through electrochemical interactions in the body. Typically, this is dangerous, leading to organ failure and other medical issues, thus generally being regarded as poisonous, but Biotics are able to exert some degree of somatic control, likely due to the specific localization of the Ezo in their bodies. Implants further refine this, allowing Biotics to apply specific currents to their own 'saturation' to create and manipulate Mass Effect Fields. 

Human biotics tend to suffer from mental health issues for several reasons. First, the human implants are relatively new, and while improving are still invasive, inefficient and typically painful, causing constant headaches, seizures, and even hallucinations. Second, the human body is a machine which requires a degree of predictability to function. Minor uncontrolled ME fields within the body, even on a microscopic scale, can have dramatic consequences. Blood clots seem the most common, but minor shifts in greymatter can cause all kinds of issues. Third, they're ostracized as freaks, commonly abused (by civilians and governments) and have few non-military benefit programs. They're outsiders, and subject to all the issues therein.

Finally... Well, it's power. Biotics can play fast and loose with one of the cardinal laws of physics, and in principle there's no limit to their power. Even a moderately powerful Biotic can create a singularity in a man's sskull, causing his brain to compress to the size of am acorn. Powerful Biotics can crush tanks, cause platoons to float into the air, and even fly. That's a lot of power to give to people who typically have mental health issues anyway...