Observer, Witch of N̷̼͎͂̐͝ȉ̸̡̬͒̓h̶̗̱͇̋̚͝i̸̼̓͝l̵̝̳̍̈͐i̶̤̯͠t̷̢̀̂̈́ỷ̵̤͒ Authority.
If witnessed, it's probably a bug.
A docile, taciturn extra boss.

Returned from the cusp of nirvana, but to what end..? Humanity doesn't return so easily, after all. . .