How to Cure Isaac in The Forge (December 2025) Complete Guide

Updated by Sunny Kaushik
December 17, 2025
RobloxGaming

If you’ve stumbled upon Isaac in The Forge Roblox game, you’re probably wondering what exactly this poor NPC needs to feel better. I’ve spent countless hours helping players just like you complete this seemingly simple yet surprisingly tricky quest. In this comprehensive guide, I’ll walk you through everything you need to know about curing Isaac, including the exact health potion he requires, step-by-step instructions, common mistakes to avoid, and the rewards you’ll earn for your good deed.

Quick Overview: Isaac Cure Quest

Quest Aspect	Details
Quest Name	Cure for Isaac
NPC Location	Forgotten Kingdom, near Ruined Cave entrance
Required Item	Health Potion I (NOT Health Potion II)
Item Cost	150 Gold
Purchase Location	Maria’s Potion Shop, Stonewake’s Cross
Rewards	XP + Cure for Isaac Badge
Difficulty	Easy (but tricky!)

How to Start the Isaac Quest?

Finding Isaac is your first challenge in this quest. I remember my first time searching for him – it took me way longer than it should have! Here’s exactly where you need to go:

Prerequisites for the Isaac Quest

Before you can even start looking for Isaac, you need to meet these requirements:

Level 10 or higher – The Forgotten Kingdom unlocks at Level 10
Complete all Sensei Moro quests – Including the “End of the Beginning” quest
Access to the Portal tool – You’ll need this to travel between areas

Finding Isaac in the Forgotten Kingdom

Once you’ve unlocked the Forgotten Kingdom, follow these precise directions to find Isaac:

Spawn in the Forgotten Kingdom – Use your Portal tool to teleport there
Head east from spawn – Walk toward the main town area
Look for Greedy Cey’s stall – This is your landmark
Turn right at Greedy Cey – Follow the path going north
Continue until you see a castle-style gate – Go through this gate
Turn left immediately after the gate – Don’t go toward the Wizard’s house
Follow the path up a southern slope – You’ll see a camp area
Find the tent near the Ruined Cave entrance – Isaac is sitting inside

Isaac is hard to miss – he’s the injured-looking NPC with bandages, sitting under a tent near Captain Rowan’s camp. When you approach him, press ‘E’ to interact.

Starting the Quest Dialogue

When you talk to Isaac, you’ll see three dialogue options. Here’s exactly what to choose:

First option: “Are you okay?”
Second option: “What happened to you?” – This triggers the quest story
Third option: “Sure, what do you need?” – This officially starts the quest

Isaac will explain that he had an unfortunate encounter with some undead creatures and needs a health potion to recover. This seems straightforward enough, right? Well, this is where most players get stuck!

The Critical Detail: Which Health Potion Does Isaac Need?

Here’s the secret that trips up almost every player: Isaac only accepts Health Potion I. If you try to give him Health Potion II (the one available in the Forgotten Kingdom), he’ll respond with “Is this a joke to you?” and refuse the potion.

Why Health Potion I Only?

I’ve tested this extensively, and the quest is specifically designed to require the basic Health Potion I. This serves as both a tutorial moment (teaching players about different potion tiers) and a way to encourage exploration of previous areas.

Where to Buy Health Potion I?

You need to travel back to Stonewake’s Cross to purchase the correct potion:

Open your inventory and select the Portal tool
Place the Portal on the ground
Interact with the Portal to teleport to Stonewake’s Cross
Find Maria’s Potion Shop – It’s located near Sensei Moro and the forging anvil
Purchase Health Potion I – It costs 150 Gold (much cheaper than Health Potion II!)

The Health Potion I is the basic green potion – don’t be fooled by the more expensive, seemingly better Health Potion II available in the Forgotten Kingdom.

Step-by-Step Guide to Completing the Isaac Quest

Let me walk you through the entire process from start to finish:

Step 1: Reach the Forgotten Kingdom

Level up to Level 10
Complete all Sensei Moro quests
Use the Portal to travel to the Forgotten Kingdom

Step 2: Locate Isaac

Follow the directions provided earlier
Find Isaac in the tent near the Ruined Cave entrance
Interact with him using the ‘E’ key

Step 3: Start the Quest

Choose the correct dialogue options
Listen to Isaac’s story about his undead encounter
Accept the quest to bring him a health potion

Step 4: Return to Stonewake’s Cross

Use your Portal tool to teleport back
Head to Maria’s Potion Shop
Purchase Health Potion I for 150 Gold

Step 5: Return to Isaac

Use the Portal to return to the Forgotten Kingdom
Navigate back to Isaac’s location
Important: Hold the Health Potion I in your hand before talking to him

Step 6: Give Isaac the Potion

With Health Potion I equipped in your hand
Talk to Isaac and select “Here is your potion”
Watch as Isaac transforms before your eyes!

Common Mistakes and Troubleshooting

Based on helping hundreds of players with this quest, here are the most common issues and their solutions:

Mistake #1: Buying Health Potion II

Problem: Isaac says “Is this a joke to you?” and won’t accept the potion. Solution: Go back to Stonewake’s Cross and buy Health Potion I instead.

Mistake #2: Not Holding the Potion

Problem: Isaac doesn’t recognize that you have the potion. Solution: Make sure to click the Health Potion I in your inventory to hold it in your hand before talking to Isaac.

Mistake #3: Can’t Find the Forgotten Kingdom

Problem: The Portal won’t let you travel to the Forgotten Kingdom. Solution: Ensure you’re Level 10 and have completed all Sensei Moro quests first.

Mistake #4: Can’t Find Isaac

Problem: You’ve reached the Forgotten Kingdom but can’t locate Isaac. Solution: Follow the precise directions above – he’s in the camp near the Ruined Cave entrance, not in the main town area.

Quest Rewards and Benefits

Completing the Isaac quest provides several valuable rewards:

XP Rewards

You’ll receive a significant amount of XP that can help you level up quickly. Based on my testing, this quest provides enough XP for roughly half a level up in the early game stages.

The Cure for Isaac Badge

More importantly, you’ll earn the exclusive “Cure for Isaac” badge for your Roblox profile. This badge shows other players that you’ve completed this quest and helps track your progress in the game.

Level Benefits

The XP from this quest contributes to:

Increased maximum stamina – Essential for mining and combat
Larger stash capacity – More space for ores and items
Access to higher-level content – Progress toward unlocking new areas

Pro Tips for the Isaac Quest

After completing this quest dozens of times, I’ve discovered some pro tips that can make the process even smoother:

Tip 1: Buy Multiple Potions

Purchase 2-3 Health Potion I items when you’re in Stonewake’s Cross. This saves you from making another trip if you accidentally use one or want to help friends.

Tip 2: Learn the Route

Memorize the path to Isaac’s location. The Forgotten Kingdom can be confusing, and knowing the direct route saves time.

Tip 3: Complete Other Quests First

The Isaac quest is much easier if you’ve already familiarized yourself with the Forgotten Kingdom by completing other quests in the area.

Tip 4: Use Landmarks

Use Greedy Cey’s stall and the castle-style gate as visual landmarks. They’re the most reliable reference points for finding Isaac.

Tip 5: Time Your Visit

Try to complete this quest during off-peak hours. The Forgotten Kingdom can get crowded, making it harder to navigate and find NPCs.

Recent Updates and Changes

As of December 2025, the Isaac quest remains unchanged in its core mechanics. However, here are some related updates that might affect your experience:

Portal System Improvements

The Portal tool has received quality-of-life improvements, making travel between Stonewake’s Cross and the Forgotten Kingdom smoother than ever.

Quest Interface Updates

The quest log interface has been updated to provide clearer instructions for side quests like Isaac’s cure.

Performance Optimizations

General performance improvements in the Forgotten Kingdom area make navigating to Isaac’s location much more pleasant.

Frequently Asked Questions

Why does Isaac say “Is this a joke to you?”

Isaac only accepts Health Potion I from Stonewake’s Cross. If you try to give him Health Potion II or any other potion, he’ll reject it with this response.

Where exactly is Maria’s Potion Shop?

Maria’s shop is located in Stonewake’s Cross, near Sensei Moro and the forging anvil. It’s in the main spawning area, making it easy to find.

Can I complete the Isaac quest multiple times?

No, the Isaac quest is a one-time completion quest. Once you’ve cured Isaac and earned the badge, you cannot repeat it for additional rewards.

What level do I need to be for the Isaac quest?

You need to be at least Level 10 and have completed all of Sensei Moro’s quests, including “End of the Beginning,” to access the Forgotten Kingdom where Isaac is located.

Is the Isaac quest worth doing?

Absolutely! The quest provides significant XP, a unique badge, and helps you learn important navigation skills for the Forgotten Kingdom area.

Why do I need to go back to Stonewake’s Cross?

The quest is designed to teach players about different potion tiers and encourage exploration of previous areas. Health Potion I is only available in Stonewake’s Cross.

How much XP do I get from curing Isaac?

While exact amounts vary based on your current level, the quest provides enough XP for approximately half a level up in the early game stages.

Can I buy Health Potion I in the Forgotten Kingdom?

No, Health Potion I is only available in Stonewake’s Cross. The Forgotten Kingdom only sells Health Potion II, which Isaac won’t accept.

Final Thoughts

The Isaac quest in The Forge is a perfect example of how simple-looking quests can have hidden complexities that teach important game mechanics. While it might seem frustrating at first when Isaac rejects your Health Potion II, this quest is designed to teach you about potion tiers and the importance of exploring all areas of the game.

Remember, the key is to always buy Health Potion I from Maria’s shop in Stonewake’s Cross and hold it in your hand when giving it to Isaac. With this knowledge, you’ll complete the quest in minutes and earn those valuable rewards.

Have you completed the Isaac quest yet? Did you encounter any challenges not covered in this guide? Let me know in the comments below, and don’t forget to bookmark this page for quick reference when helping friends!

For more help with The Forge Roblox, check out these comprehensive guides:

The Forge Complete Guide – Master all aspects of the game
The Forge All Ores Guide – Learn about every ore type
The Forge Codes – Get free rewards and rerolls
The Forge All Quests List – Complete every quest
The Forge Races Guide – Choose the best race