Anybody got a complete list of things you cannot insta-kill?

Rather "insta-meh mechanics" 'cause they work only AGAINST you in this gaem.

I’m not sure if there are any enemies who can’t be insta killed. Even servants can be insta killed. There’s just a super low chance of it which functionally makes it like servants are immune to insta killed.

It's not that you can't, you just have 0.1% chance
Death chance basically gets lower on stronger enemies, so in case of some bosses can be 1% or less

To clarify for them: Every enemy and servant has a "death rate".

For most servants you have, it's between 20% and 50%. For most basic enemies it seems to be 100%, and for most bosses it's 5% or less, often under 1% or even 0.1%.

When you use a move with a "100% insta-kill chance" it means 100% of the "death rate".

That means that you always kill basic enemies, and have a 1% chance of killing the boss with a 1% death rate.

It also means your servants have whatever chance of dying as seen in their stats.

When you lower their death resist, it multiplies this. So if you lower the boss's death resist by 100% it doesn't go from 1% to 101%. It goes from 1% to 2%.

This is why the only "insta-death" person worth their salt is Nitocris, because she can clear the first or second waves easily while holding an event CE.

The others might be good servants, but their instant-death isn't good.

It's hard to kill even a large dragon with both Shiki and Nitocris' first skils on effect. Like the first guy said, it's pretty much an insta-meh mechanics. But they're quite useful against enemies with high death rate like ghosts and roman soldiers. I remember when I was a lowbie, I used to insta-kill the centaurs who likes to crit a lot in Caldera Island using a Stheno.

Let this be your guide: Silver and bronze-named enemies can be easily insta-killed.