
1. The monarch of frost doesn't use poison, he said the mac used poison on his dagger.
2. The monarch of frost was stabbed with the poison dagger and is fine ago they are apparently immune, or at least the monarch of frost is.
3. The hunter hunters association (attempts) to save lives so I don't think they would choose to make someone monster kibble, and even if they did refer back to point 2 ╮( ̄▽ ̄)╭

Wait I'll be back for you, with the chapter numbers (of the light novel) dialogues and all just wait
But I have to agree the 3rd one is quite right though (but the German hunter who "will" when the next battle begins, and he lunges towars the beast, knowing this would be his last time, so... why can't someone rescue the humanity by doing it the way I suggested? In both ways... he will still die and both options are heroic... but yeah I told u are ryt there cuz if sun jin woo were to show up late, the German hunter would die by the poison but he does... so he can heal him with beru and his... ummm... so called drink... so... yeah... u r quite ryt)

Spoiler warning!
Oh let me correct myself... or well show u that I am correct
Seong jin woo has an attribute like thing which makes him immune to poison... u know that ryt? And when he threw his dagger covered with poison at the sovereign of frost, he does get hurt and it doesn't even heal. It is mentioned in the 216th chapter of the novel
*Perhaps the Ice Elf felt the aching from the wound on its shoulder inflicted by Jin-Woo the last time, since its expression crumpled
unsightly rather quickly.
[You insolent b*stard!]
*
Nd (sorry it was the sovereign of plague who throws poison at him... aka the insect queen) throws poison at sung jin woo
*The [Insect Monarch] hurled green vomit toward Jin-woo. Jin-woo lightly blocked the vomit with [Ruler’s
Hand]
The poisonous energy left in the air was treated by the passive-skill.
System rang--
[The effect of the skill ‘extreme poisoning’ remains in the air]
[The effects of the ‘Buff: Detoxification’ will be activated]
[3,2,1… Detoxification completed]* 216th chapter of the novel
see? Sovereigns still use poison against sovereigns, so that means poison works for most of them or they do not know if it works for sung jin woo
And the next part
So yeah...
"Evidence" and "explained"
ps: fuck i had to download the whole ass novel with 2000+ chapters so u better read this

https://pdfcoffee.com/solo-levelling-1-240pdf-pdf-free.html
Here u go babe!
Have fun reading!
Oh and btw in the real/published book, there are a few different words... so... if u have a hard time understanding,
Just read it through the below site
https://www.lightnovelpub.com/novel/i-alone-level-up-solo-leveling-10051457
So if sovereign of frost uses poison it means the poison is able to harm sovereigns right? So why can't the hunter association, poison a person and let him be eaten...(⊙…⊙ )
Don't come at me guys... I've just spent too much time on this...( ̄∇ ̄")