After Kayneth El-Melloi Archibald was defeated by Kiritsugu Emiya in the Fourth Holy Grail War, Lord El-Melloi II inherited the Mystic Code and reprogrammed it as a "multi-purpose maid golem." While her education was almost completed, she was shown a "detrimental movie" featuring a "killer robot from the future" by Flat Escardos. People think that she was made by Lord El-Melloi II, but he actually only gave advice to Reines El-Melloi Archisorte. She began acting as the maid of Reines and her bodyguard.
Her skin was a colour completely unsuited to human beings; a shining silver.
Trimmau has the intellectual capacity to perform simply household chores. She has a "troublesome bug," where Trimmau insists to be a golem made from futuristic science instead of magic, in which she rampages around occasionally thinking that she is a "killer robot from the future" due to the movie she watched in development.
Trimmau and Reines invaded into Lord El-Melloi II office. They waited for Lord El-Melloi II after he finishes his discussion with Bram Nuada-Re Sophia-Ri and Rocco Belfaban. Before leaving the room, she makes a thumbs up and murmured "I'll be back".
Lord El-Melloi II Case Files
Case. Adra Castle Separation
Case. Twin Towers of Izelma (Upper)
Trimmau was apparently the leading design in the field of Automata. It's been said that even though the field of Magecraft which deals with creating artificial humans has already started its decline, this particular Automata was of a completely different essence, and so avoided the problem.
Trimmau specializes not only in acting as a bodyguard, but also in using her body to clean and invade places. There are still many secrets regarding the full details of her abilities. Trimmau can transform herself as an armour.
- ↑ 1.0 1.1 1.2
 Fate/Zero material - Encyclopedia: Volumen Hydrargyrum [Magecraft], p.092
Volumen Hydrargyrum [Magecraft]
One of the mystic codes employed by Lord El-Melloi. Essentially, it is a mass of magically-infused mercury that has been filled with a large variety of movement patterns and programmed to respond appropriately depending on the situation. I guess you could call it a kind of battle golem? Out of all of Kayneth's armaments, it has the greatest capacity for physical destruction. He had prepared many other mystic codes designed for battles with curses and conjurations, but the vast majority of them were lost when his hotel was blown up by Kiritsugu.
Though it wouldn't be wrong to call it an almighty weapon due to its versatility, in the end it is still just an automaton, and once you see through its movement patterns it's fairly easy to handle. Also, since the magical energy required to operate it is directly proportional to the complexity of its shape, it is necessary to keep it in its basic form as much as possible – switching to a more complex form drastically reduces its reaction speed and power. The final "sea urchin" transformation used in the battle against Kiritsugu was a form that combined both raw defensive ability and cunning, but accordingly the drain on Kayneth's magical energy was immense.
By the way, after the war ended Lord El-Melloi II may or may not have reprogrammed this mystic code and employed it as a multi-purpose maid golem. Though it has enough intellectual capacity to perform simple household chores, it seems there's a troublesome bug that pops up every now and then that causes it to rampage around insisting that it's a killer robot from the future. Maybe it was shown a detrimental movie just when it was on the verge of completing its education in good taste…?
- ↑ 2.0 2.1 2.2
 Fate/Apocrypha material - Encyclopedia: Trimmau [Others], p.178 [T]
The advanced version of the “Volumen Hydrargyrum: Marrow of the Moon Spirit” Kayneth El-Melloi Archibald used for battles of magecraft in “Fate/Zero”. Currently, the legitimate El-Melloi successor, Reines, is using it as a mercury maid. She (the maid) specializes not only in acting as a bodyguard, but also in using her body to clean and invade places.
People think that she was made by Lord El-Melloi II, but he actually only gave advice to Reines. There are still many secrets regarding the full details of her abilities. These details should be brought to light in “Lord El-Melloi II’s Case Files” (Author: Sanda Makoto), so please look forward to it. (It’s my style to throw difficult subjects at Mr. Sanda.)
- ↑ 3.0 3.1 3.2 Lord El-Melloi II Case Files - Case. Adra Castle Separation: Chapter 1 Part 1, p.025-026
- ↑ Fate/Apocrypha - Volume 3: Chapter 4, p.392
- ↑ Lord El-Melloi II Case Files - Case. Twin Towers of Izelma (Lower)