Didn't his contract with Mashu makes him resistant to mental attacks/debuffs?
Actually the protagonist has piss-poor resistance to mental attacks, which is why Servants with affinity for dreams like Dantes normally covers for them, it's not fullproof though since Servants like Abigail and Lady Avalon can still invade your dreamscape without permission.
I already think that all the time!?
WAHAHAHAHA! (blush)Well, some targets do have resistance to that sort of thing.If my charm isn't working that's kind of depressing honestly.No need to worry about it-It's not affecting me at all yet!HNNNNGGH!Take this!Yeah right, I can see it plain as day! (LOL) See, I knew it.If it's you master, even the minimum output is enough to floor you.N-No!You so can't stop seeing me as cute huh?