What ability is being able to induce a coma on a person?

[TartaChocholate]

Well, at first I thought it would be akin to Sleep Manipulation, but a coma is usually caused by biological reasons like damage to the brain or chemical imbalances from what (little) I know, so not quite the same?. The specific scenario I mean is the presence of a hazardous substance in the air that when inhaled in large enough amounts caused some people to fall into a coma (the condition of the affected people was openly called such).

Thanks in advance!

 

[It_is_i_wyatt]

how does the character do it