Why Mash attacking them? and is she the only successful demi servants

Galahad is angry for the experiments they done to her. He’s an honorable and known to be one of the greatest knights so he won’t let this nonsense slide but when she stopped him from killing them he chose to sleep within her and lent her his powers again in Singularity F

Then he later accepted mash?

Galahad was having none of that shit inside her body

I see so she's the only human made servant i mean successful experiment

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This prequels the game. When Galahad was summoned into Mash, he was PISSED at what was done to her and the others, cause he's very honorable. But Mash stops him from destroying Chaldea, so he decides to just slumber within her, which is why she can use his NP.

That's not mash. That's Gallahad trying to rip the chaldea staff apart because he's disgusted they'd use a girl for such an experiment

The glowing eyes means it's actually Galahad (like a Yami-Yugi thing). He is PISSED, Sir Galahad is the Heavenly Knight Who Ascended To The Heavens, the most pure, noble and probably the Knight of the Round Table most detached from humanity (worse than Artoria)

Imagine being woken up and seeing human atrocities being carried out on a little girl for years until they finally manage to grant her your power. Now imagine when you two are finally one, you have the opportunity to give these people a piece of your mind-

I think I've watched all of Fate/grand Order, but i don't recognize this one. What's this one called? Asking for a friend here

Galahad had certain opinions about how Chaldea was operating. He decided to make those opinions unambiguous by trying to turn Marisbury into a smear on the wall.