ASTD X: Ghost III Rainbow & EXP IV Farming Guide (March 2026)
Ghost III (Rainbow) and EXP IV are two essential materials in All Star Tower Defense X (ASTD X). Ghost III is obtained primarily through Daily Challenge Expert Mode with up to 100% drop rate on specific rotation days, while EXP IV must be crafted by combining three EXP III units from Infinity Mode farming. These materials are required for ascending 5-star units and rapidly leveling characters to level 80.
This guide reveals the exact farming methods, optimal strategies, and time-saving tips that top players use to efficiently collect these crucial resources. You’ll discover the best game modes, team compositions, and daily routines that maximize your material gains.
Quick Overview of Ghost III Rainbow & EXP IV Farming
| Material | Type | Primary Source | Drop Rate | Best Farming Method |
|---|---|---|---|---|
| Ghost III (Rainbow) | Ascension Material | Daily Challenge (Expert) | Up to 100% (rotation-based) | Wait for Daily Challenge rotation |
| EXP IV | Experience Material | Crafted Only | N/A | Farm Infinity Mode + Craft 3 EXP III |
What Are Ghost III (Rainbow) and EXP IV in ASTD X?
Before diving into farming strategies, let’s understand why these materials are so crucial:
Ghost III (Rainbow)
Ghost III (Rainbow) is a rare and crucial enhancement item required for evolving and upgrading units to their maximum potential. It’s especially valuable for advanced players focused on endgame content. This high-tier material is essential for ascending most 5-star units in ASTD X, making it one of the most sought-after resources in the game.
EXP IV
EXP IV is a premium experience material used to level up units faster, but it cannot be obtained directly—players must craft it by combining three EXP III. According to the game mechanics, 23.2 no of Exp IV units are needed to raise a unit to the maximum level 80, making efficient farming crucial for progression.
How to Get Ghost III (Rainbow) in All Star Tower Defense X?
Method 1: Daily Challenge – Expert Mode (Best Method)
This is where you’ll find the highest chance, sometimes guaranteed, to get Ghost III. The Daily Challenge Expert Mode is your primary farming location, but timing is everything.
Key Points:
- Drop Rate: Can be guaranteed on specific rotation days
- Difficulty: Expert mode requires a strong, well-coordinated team
- Rotation: Challenge content changes regularly and missing the right day means missing out on an easier Ghost III
Pro Strategy: Check the daily rotation immediately upon login. When Ghost III is featured in the Expert Daily Challenge, clear your schedule – this is your best opportunity to stock up.
Method 2: Future City – Expert Challenge Mode
Offers around 30% drop chance for Ghost III. Not as reliable as the Daily Challenge, but still worth grinding when it’s available.
When to Farm Future City:
- When you’ve missed the Daily Challenge rotation
- Need additional Ghost III beyond daily limits
- Have extra time for grinding
Method 3: Other Challenge Modes
Other Challenge Modes (both Hard and Expert difficulties) can occasionally drop Ghost II or, rarely, Ghost III, but the odds are significantly lower.
Consider These When:
- All other options are exhausted
- You’re already farming for other materials
- Combined with skill orb farming for efficiency
Ascension Requirements for Popular Units
Here’s what you’ll need Ghost III for, based on the required materials for ascension:
| Unit | Ghost III Required | Other Materials | Gold Cost |
|---|---|---|---|
| Slayer Mage | 5 Ghost III (Rainbow) | 7 Mage Staff, 5 Ghost I (Orange) | 5,000 |
| Mysterious X | 5 Ghost III (Rainbow) | 7 Mysterious Cube, 5 Ghost I (Blue) | 5,000 |
| Borul | 5 Ghost III (Rainbow) | 7 Borul’s Necklace, 5 Ghost I (Green) | 5,000 |
| The Cursed One | 5 Ghost III (Rainbow) | 7 Cursed Toe, 5 Ghost I (Red) | 5,000 |
| Dark Wing | 5 Ghost III (Rainbow) | 7 Lightning Lance, 5 Ghost I (Green) | 5,000 |
How to Get EXP IV in All Star Tower Defense X (ASTD X)?
Unlike Ghost III, EXP IV cannot be obtained as a direct drop. Instead, you must craft EXP IV by combining three EXP III items using the game’s crafting or evolve menu.
Step 1: Farm Infinity Mode
The best place to gather EXP I, II, and III is Infinity Mode. While Infinity Mode does not drop EXP IV outright, it consistently supplies lower-tier EXP materials.
Infinity Mode Farming Tips:
- Enter via the teleport option in the main hub
- Focus on reaching wave milestones (every 10 waves)
- You get a small amount of xp by completing stories and challenges
- Build a sustainable team that can auto-clear early waves
Step 2: Understanding EXP Drop Rates
Based on game mechanics:
- Waves 1-10: Primarily EXP I drops
- Waves 11-30: Mix of EXP I and EXP II
- Waves 31+: Better chance for EXP II and occasional EXP III
Step 3: Crafting Process
- Access the Evolve Menu: Open your unit inventory and select any EXP unit
- Select EXP III: You need exactly 3 EXP III units
- Combine: Click the evolve button to craft one EXP IV
Crafting Math:
- 3 EXP I → 1 EXP II
- 3 EXP II → 1 EXP III
- 3 EXP III → 1 EXP IV
- Total: 27 EXP I = 1 EXP IV
Advanced Farming Strategies
Building the Perfect Farming Team
For both Ghost III challenges and Infinity Mode, you’ll need a strong team. Based on the best units in ASTD X, consider:
- The Strongest One – Essential for burn damage
- Slayer Mage – Multi-hit for shields
- Mysterious X – Crowd control
- Dark Wing – Scaling damage for long runs
- Support Unit – Buff/debuff capabilities
Optimal Daily Routine
Morning (Reset Time):
- Check Daily Challenge rotation
- If Ghost III is available, prioritize Expert Mode
- Complete daily tasks for additional rewards
Throughout the Day:
- Farm Infinity Mode during downtime
- Check challenge rotations every 30 minutes
- Craft EXP IV as you accumulate materials
Evening:
- Final Infinity Mode push
- Prepare teams for next day’s challenges
Resource Management Tips
- Never Skip Ghost III Days: Missing a day with high drop rates for Ghost III means waiting another cycle
- Batch Crafting: Save EXP III until you have multiples of 3
- Priority Units: Focus on ascending meta units first
- Code Redemption: Check for ASTD codes that might include materials
Common Mistakes to Avoid in ASTD X
1. Ignoring Daily Rotations
The biggest mistake is not tracking when Ghost III appears in Daily Challenges. Set reminders or join community Discord servers for notifications.
2. Inefficient Infinity Mode Farming
Don’t quit too early – the best EXP drops come from higher waves. Build a sustainable team that can reach at least wave 50.
3. Wasting Ghost III on Non-Meta Units
With only 5 Ghost III needed per ascension, prioritize units that will actually improve your team composition.
4. Not Understanding Skill Trees
Before ascending, understand the ASTD X skill tree system to maximize your investment.
Team Compositions for Farming
Expert Challenge Team
Formation:
- Front Line: Tank unit with high durability
- Mid Range: The Strongest One + Slayer Mage
- Back Line: Dark Wing (elevated position)
- Support: Buffer/Debuffer
- Flex: Additional DPS or crowd control
Infinity Mode Sustain Team
Key Units:
- Units with Employment skill (20% money bonus)
- AoE damage dealers for wave clearing
- At least one flying unit for air enemies
- Sustain/healing support if available
Maximizing Efficiency
Challenge Mode Optimization
- Team Preparation: Have multiple team loadouts ready
- Timing: Challenges rotate every 30 minutes
- Difficulty Selection: Always attempt Expert first
- Resource Investment: Don’t hesitate to use items for guaranteed Ghost III
Infinity Mode Optimization
- Wave Goals: Set realistic wave targets (30, 50, 70)
- Auto-Skip Usage: Enable after establishing defense
- Placement Strategy: Maximize coverage with proper positioning
- Economy Management: Prioritize money-generating units early
Alternative Methods & Future Updates
Event Rewards
Keep an eye on special events that might include Ghost III or EXP IV as rewards. These are rare but valuable opportunities.
Code Redemptions
Developers occasionally release codes with materials. Always check:
- Official Discord announcements
- Game social media channels
- Community resources
Trading (If Implemented)
While not currently available, trading systems might be added in future updates.
Frequently Asked Questions
How many Ghost III do I need to ascend one unit?
Most 5-star units require exactly 5 Ghost III (Rainbow) for ascension, along with other specific materials and 5,000 gold.
Can I get EXP IV directly from any game mode?
No, EXP IV must be crafted by combining 3 EXP III units. There’s no direct drop source for EXP IV in any game mode.
What’s the best wave to stop at in Infinity Mode?
For efficient EXP farming, waves 30-50 offer the best time-to-reward ratio. Going beyond requires significantly more time for diminishing returns.
Should I save Ghost III or use them immediately?
Use them on meta units immediately. There’s no benefit to hoarding, and ascending key units will help you farm more efficiently.
How long does it take to farm enough Ghost III for one ascension?
With optimal daily rotation tracking, you can gather 5 Ghost III in 1-2 weeks. Without daily challenges, it could take significantly longer.
Can I farm Ghost III in Story Mode?
No, Story Mode doesn’t drop Ghost III. Stick to Challenge Modes for this rare material.
What’s the conversion rate for EXP materials?
It takes 27 EXP I to create 1 EXP IV through the evolution chain (3:1 ratio at each tier).
Do different colored Ghost materials have different uses?
Yes, Ghost I comes in different colors (Orange, Blue, Green, Red, Purple) and specific units require specific colors for ascension.
Conclusion
Farming Ghost III (Rainbow) and EXP IV in ASTD X requires patience, strategy, and consistent daily play. Prioritize Daily Challenge – Expert Mode when Ghost III is available, and grind Future City – Expert Challenge for extra chances. For EXP IV, focus on consistent Infinity Mode runs and crafting in the evolve menu.
Remember, these materials are the gateway to unlocking your units’ full potential. By following this guide and maintaining a consistent farming routine, you’ll have a steady supply of both Ghost III and EXP IV to keep your team at peak performance.
Stay updated with the latest tower defense strategies and don’t forget to check for new codes regularly. The meta evolves quickly in ASTD X, but with proper resource management, you’ll always be ready for the next challenge.
Good luck with your farming, and may your ascensions be swift and your EXP gains massive!