1) First of all, I would make it so in the encounter the villain will say that he has improved the poison again: what’s the point of an incurable poison, if it brings a lot of unwarranted attention? All the test subjects have died instantly, and now the poison is supposed to kill instantly. Renfeld took 10 days to die, and Eldathin (ingame) dies (almost) instantly, so that could definitely suggest that the poison now is even more than dangerous than before.
2) I would allow the player to catch the arrow and to also save the life of the guy, if he so wills. Personally, I find it odd that you are left untouched by the person brewing the poison and that person only kills the priest and not you escorting him, even if you are far behind.Why would the evil boss leave you alive, considering that you've seen his face?
I should add that charname should be offered to accompany him to the meeting, and let RP option rise from it. Catch the arrow, or not?
3) In the case the player doesn’t catch the arrow, you would witness first hand that the quality of poison has definitely gone up, because there is no more waiting for days before dieing (Renfeld takes 10 days) but Eldathin dies instantly. I would say that Eldathin hit by the poisoned arrow being able to conveniently mark you the place on the map without issues and to tell you everything you need to know is a little "gamey".
4) If the player wishes to save the life of his “friend”, the poison doesn’t kill him instantly, BUT It should have a (very very) huge debuff. The high priest would start questioning what went differently this time: why didn’t you die ? Was it because the final boss is planning to send a message or for other reasons? You could refer to the fact that you are partially divine and the high priest would say that you probably owe your life to your Dad.
c) once you enter the enemy area, I would say that:
- if you catched the arrow, you should meet the second in command instantly. He was there, and you were supposed to be dead. So he proposes you to come with him and that no harm will be done to you. He also says that something good will come out for you.
- if you didn’t catch the arrow, you will meet him once you enter the place and you will be poisoned as well. You will reach him, still alive, but obviously he will still try to propose you a deal, because you are supposed to be dead.
- once you are inside, you are asked (politely) if you wish to work with them or not. You can obviously refuse, but you can also accept.
If you accept to work with them, they will tell you that they wish to study you, because the poison wasn’t supposed to fail. They will try to question you and you will tell him why you are still alive: the poison is great, but you are a demigod. The evil chief will say that it will study your body and how to improve the poison, but he requires time. While doing so, he says that the attention of the followers of Eldath is annoying and that you should deal with them. He will offer you a special bottle, designated to pollute the waters of that spring and ask you to do so stealthily.
You will be given an amulet so creatures in the swamp won’t attack you, and you could also add some “evil” quests: I would gladly enjoy them.
After polluting the "swamp", you will talk oince again with the evil boss and he will tell you that he knows how to improve the poison to make it lethal even for demigods: he thanks you for that, reminding that you will be immune, because your body will reject the poison with time.
They propose to give you a gift, if you promise to use it against Eldath' followers. Kill them all with the poison you will be given to send a message..
Once you go back, you will find the new "polluted" area. Is it changed due to poison? What happened in general? Do they realize it was you? Are they all weakened? Your choice.
After having killed them all, you will have the gift: you are now gifted the skill (in game) of Use poison (the potent version – before it was nerfed by beamdog), or, if you are already an assassin, it will be improved to be the potent poison before the nerf done by Beamdog. Even if you are no assassin, you gain one use at level 1 and an additional use every 4 levels thereafter.
OR
you could add the use poison skill added here, if you ask Olvynchuru: https://forums.beamd...eving-skills/p1
Having done all of that, and being immune, there is only one thing that the player should do. Turn against them and kill them all.