Doubleyolkeggs

John gets a second chance at life, going back to the time before "The Gate to Another World" appeared. Betrayed in his past life as a pharmacist, he decides he can't trust anyone anymore. So, he opts for a hidden profession, becoming a poison master disguised as a regular pharmacist to everyone else.
To the other awakened ones, John is just your run-of-the-mill potion maker. 
Little do they know, every healing potion he brews is laced with deadly poison.
"John, heal me quick... Fuck! John, what did you do to me? Why have I turned bald?"
"John!!Why did my penis turn into a mushroom after drinking your potion?"
"You guys dare to drink John's healing potions? I saw with my own eyes last time, he threw a bottle of his healing potion and it directly stank a Corrupt Lord to death!"
"And that's nothing! I saw a toxic serpent bite John, and guess what? The serpent got poisoned to death by him!"
John sneered at the collapsed crowd, "I've said it before, though my potions are free, they come with some minor side effects. Want to get rid of the side effects? That'll cost extra!"
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Supreme therapist：My healing potions can even poison the gods

John didn't take long to awaken Eliza and Hardy from their mental worlds.

Afterward, he shared all the clues he had previously discovered about the boss of the Horror Amusement Park with the others.

"This is the situation. I've found the weakness of the boss of the Horror Amusement Park. What we need to do next is to face the boss head-on! Before that, you must make the necessary preparations."

John hoped the other three would be thoroughly prepared.

He knew very well that during the confrontation with the boss of the Horror Amusement Park, they would all face intense mental interference.

If anyone wasn't prepared and fell into an illusion, it could be impossible to escape from it.

"These are the potions I've prepared. Before you engage in battle with the boss of the Horror Amusement Park, you must drink these. These potions will ensure you stay clear-headed during the fight."

The potions John concocted were a mix of various venoms.

Facing the Boss of the Horror Amusement Park