Isaac’s quest in The Forge is one of the quickest and easiest quests to complete, but many players still get stuck because he only accepts one specific potion.
If Isaac keeps rejecting your item or you can’t figure out which potion he needs, this guide explains the exact steps to finish the quest smoothly.
This walkthrough covers Isaac’s location, how to start the quest, the correct potion to bring, and how to turn it in for rewards.
Where to Find Isaac in The Forge
Isaac is located in the Forgotten Kingdom, right in front of the cave entrance near the main campfire. If you’ve already unlocked and used the Portal Tool to travel to the second island, you’ll recognize this area easily.
The large cannon that launches you toward the cave drops you almost directly near Isaac’s tent.
He sits under a small shelter to the left of Henry NPC. Walk up to him and press E to start the interaction.
How to Start Isaac’s Health Potion Quest
When you talk to Isaac, you’ll see multiple dialogue options. To begin the quest:
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Select the option where you ask what happened to him.
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Isaac explains his injury.
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Choose “Sure, what do you need?” to officially start the quest.
He will then ask for a Health Potion. But the important part is knowing exactly which potion he wants.
Which Potion Does Isaac Accept?
Isaac only accepts Health Potion I.
Players often try giving him Health Potion II from the Forgotten Kingdom, which leads to the famous rejection message:
“Is this a joke?”
No matter what else you bring, Isaac will not accept anything except Health Potion I, the basic beginner healing potion.
Where to Get the Correct Health Potion
To get Health Potion I, follow these steps:
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Use your Portal Tool to return to Stonewake’s Cross.
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Go to Maria’s Potion Shop, located near Sensei Moro.
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Buy the green Health Potion I for $150.
This is the only potion that completes Isaac’s quest.
SEE ALSO:
How to Turn In the Potion and Complete the Quest
Teleport back to the Forgotten Kingdom using your Portal Tool.
Walk to Isaac again and interact with him. Select the dialogue option that says:
“Here is your potion.”
Once you hand it over, Isaac instantly heals. His appearance changes as his hair returns to normal and the bandages disappear.
You will receive:
• A big XP reward
• A cash bonus
This makes Isaac’s quest one of the best and fastest money-and-XP quests for beginners and mid game players.
Why Isaac Might Reject Your Potion
If Isaac refuses to take your potion, the reason is simple:
• You are not giving him Health Potion I
• Health Potion II or any other potion will not work
Return to Stonewake’s Cross and buy the correct potion to fix this.
Final Notes
Isaac’s quest is incredibly quick to complete and perfect for early progression. It teaches players how to use the Portal Tool effectively and gives a nice reward with almost no effort.
Nishant Singh is a gaming writer with a passion for Roblox and the Call of Duty franchise. He enjoys exploring new titles, sharing tips, and writing stories that bring the gaming world to life.