- Yet Another Zombie Survivors skill tree upgrades affect your entire team between runs.
- Training Points unlock permanent improvements across five upgrade categories.
- Team Level gates later skills, so spreading early points can improve progression speed.
- Best starting priorities depend on whether your build needs damage, defense, speed, or faster growth.
- Refundable upgrades let you change direction when a new character combination needs different stats.
Yet Another Zombie Survivors Skill Tree Explained
The Yet Another Zombie Survivors skill tree is the game’s team-wide upgrade system. It is also described as Training or the Upgrade Tree. These skills are purchased with Training Points and can be refunded, allowing you to adjust your permanent progression when your preferred squad or weapon strategy changes.
The system becomes available after earning the A Horrible Night to Have a Curse achievement. The achievement requires dying once, so access is tied to normal early progression rather than a hidden collectible or a special character requirement.
Video Highlights:
- Permanent team improvements support both offense and survivability.
- Character selection and upgrade priorities should work together.
- Defensive and damage-focused builds benefit from different long-term investments.
- Critical chance, attack speed, ability damage, and health can all shape a run.
The upgrade tree contains 20 unique skills across five categories. Unlocking every listed upgrade requires 475 Training Points, while each category requires 95 Training Points. Every category contains two named skills, and each skill has five tiers.
| Upgrade System Detail | Value | Practical Meaning |
|---|---|---|
| Total unique skills | 20 | Five categories with four upgrade paths per category |
| Upgrade categories | 5 | Endurance, Charisma, Strength, Intellect, and Agility |
| Cost per category | 95 points | Enough Training Points to complete that category |
| Total cost | 475 points | Required to unlock all listed upgrades |
| Refund system | Available | Points can be reassigned when your build changes |
Do not treat the first upgrade path you choose as permanent. Because upgrades are refundable, build toward your current team needs and respec when a different strategy becomes more valuable.
Upgrade Categories and Their Effects
Each category improves a different part of your team’s performance. The most useful starting path depends on the problems you face during runs. If enemies overwhelm your squad, Endurance can provide a safer foundation. If your weapons feel weak, Strength offers direct offensive improvements. Intellect and Charisma help accelerate future growth, while Agility improves movement and weapon tempo.
| Category | First Skill | Effect | Second Skill | Effect |
|---|---|---|---|---|
| Endurance | Good Workout | Start with additional health points | Rock Hard | Reduce damage received from enemies |
| Charisma | Universal Income | Collect more money | Faster, Better... | Reduce ability cooldown |
| Strength | Bigger Bullets | Increase weapon damage | Power Metal | Increase ability damage |
| Intellect | Role Player | Collect more experience points | Magnetium Supplement | Increase pickup range for experience and power-ups |
| Agility | Gotta Go Fast | Increase survivor movement speed | Trigger Happy Havoc | Increase weapon fire rate |
Endurance
Endurance focuses on health and damage resistance. Good Workout increases your starting health, while Rock Hard reduces damage received from enemies. This category is a practical choice when learning enemy patterns, surviving crowded arenas, or using a build that needs time to establish its damage output.
Charisma
Charisma improves money collection and ability cooldown. Universal Income supports future purchases, while Faster, Better... allows abilities to become available more frequently. This combination is useful for players who want stronger economic growth and more consistent ability usage over multiple runs.
Strength
Strength is divided between weapon damage and ability damage. Bigger Bullets improves weapon output, while Power Metal increases ability damage. The category is especially relevant when your team already survives comfortably but struggles to clear dense groups or damage bosses quickly.
Intellect
Intellect improves experience collection and pickup range. Role Player increases the experience you collect, and Magnetium Supplement expands the range used to collect dropped experience and power-ups. This category supports faster in-run development and can reduce the need to make risky movements through enemy crowds.
Agility
Agility improves movement speed and weapon fire rate. Gotta Go Fast helps survivors reposition, while Trigger Happy Havoc increases weapon firing speed. Mobility can provide more room to dodge, and attack speed can complement rapid-fire weapons or builds that rely on repeated hits.
Survival Path
- Endurance
- More starting health
- Reduced incoming damage
- Good for learning and crowded arenas
Damage Path
- Strength
- Higher weapon damage
- Higher ability damage
- Good for faster clearing
Tempo Path
- Agility
- Faster movement
- Increased weapon fire rate
- Good for evasive and rapid-fire teams
Choose the category that fixes your most common failure point. More damage is valuable, but survival, experience range, or movement speed may create better results for a developing squad.
How Team Level Unlocks Later Skills
The skill tree uses Team Level to control access to later upgrades. Team Level measures the total number of individual upgrade levels purchased, not the number of Training Points spent. This distinction is important because expensive upgrades do not provide extra Team Level progress compared with cheaper upgrades.
For example, placing one point into each of the first-row skills can reach Team Level 5 for five Training Points. Alternatively, maxing one first-row skill can also produce Team Level 5, but it costs more points. If your goal is to reach a later skill, spreading points across available early skills is generally more efficient.
| Team Level Principle | What It Means | Recommended Action |
|---|---|---|
| Counts upgrade levels | Each purchased tier contributes to the raw total | Track total tiers, not point cost |
| Gates later skills | Some skills require Team Level 10 | Spread early points to reach thresholds efficiently |
| Does not measure spending | Five points can produce different costs | Avoid maxing one path too early |
| Refunds can lower progress | Removing upgrades may drop your threshold | Check which skills become unavailable |
| Threshold refunds apply | Skills owned before falling below a threshold are refunded | Rebuild your allocation after a major respec |
Efficient Early Allocation
When starting a new progression plan, place points across the first available skills instead of immediately maxing one path. This approach can help you reach Team Level 10 while preserving more Training Points for the next unlock.
A balanced early plan might include:
- One tier in several accessible skills.
- Additional points in the category that matches your preferred squad.
- A pause before expensive max-rank investments.
- A review after reaching the next Team Level threshold.
This is not a requirement for every run. If one stat directly supports your strategy, concentrating points can still be reasonable. The important point is understanding the tradeoff between immediate strength and faster access to later skills.
Unlock the Training System
Earn the A Horrible Night to Have a Curse achievement by dying once. After the upgrade system becomes available, open the Training or Upgrade Tree screen.
Identify Your Main Weakness
Decide whether your team needs more health, damage, experience, money, movement speed, cooldown reduction, pickup range, or weapon fire rate.
Spread Early Tiers
Use affordable early upgrades across the available paths when you are aiming for a Team Level threshold. This creates progress without spending too many points on one skill.
Invest Into a Core Category
Once the next threshold is secured, prioritize the category that supports your preferred characters, weapons, and abilities.
Refund and Rebuild When Needed
If your strategy changes, refund the current allocation and confirm whether the new plan remains above important Team Level thresholds.
Refunding enough tiers to fall below a Team Level threshold can remove access to skills purchased before that threshold. Recheck your allocation after every major refund.
Best Skill Tree Priorities for Character Builds
The upgrade tree is strongest when it complements the characters and weapons chosen during a run. Character combinations determine the available weapon and ability profile, while permanent upgrades improve the team’s baseline performance.
A poison-focused team that uses damage-over-time effects and regeneration may value survivability and ability support. A defensive turret setup can benefit from damage resistance, ability damage, cooldown reduction, or pickup range. A high-critical, rapid-fire team can make particularly good use of weapon damage, fire rate, and movement options.
| Build Direction | Strong Starting Categories | Why They Fit | Main Tradeoff |
|---|---|---|---|
| Durable damage-over-time team | Endurance, Strength | Survive while effects wear down enemies | Slower economic scaling |
| Turret defense team | Endurance, Strength, Charisma | Protect the team while abilities and turrets work | Less emphasis on movement |
| Critical rapid-fire team | Strength, Agility | Improves weapon output and firing tempo | Requires more positioning |
| Growth-focused progression | Intellect, Charisma | More experience, pickup range, and money | Lower immediate damage |
| Evasive beginner setup | Endurance, Agility | More room to dodge and better survivability | May clear slower at first |
Weapon-Focused Priorities
For weapon-heavy teams, start with Bigger Bullets and consider Trigger Happy Havoc after establishing enough survivability. Weapon damage improves the value of every attack, while fire rate can increase the number of hits produced during a short opening.
The critical-focused build described in the available strategy material uses Heavy, Huntress, and SWAT. Its central idea is to combine a high-rate weapon with critical-focused support and another automatic weapon. The skill tree can reinforce that plan through Strength and Agility, although the best allocation still depends on the run’s current difficulty and your ability to avoid damage.
Ability-Focused Priorities
Teams built around turrets, shields, lasers, flamethrowers, or other abilities should consider Power Metal and Faster, Better.... Higher ability damage improves output, while reduced cooldowns allow important tools to return sooner.
The defensive Engineer, Ghost, and Pyro combination benefits from a setup that lets abilities control space while the survivors remain relatively safe. Endurance can make mistakes less punishing, while Intellect may help collect experience and power-ups without leaving a protected position.
Mobility and Pickup Priorities
Gotta Go Fast is valuable when your strategy depends on dodging bosses or moving through large groups. Magnetium Supplement helps collect experience and power-ups from a safer distance. These upgrades may not produce the largest damage numbers, but they can improve consistency by reducing unnecessary exposure.
Use Strength for direct damage, Endurance for survival, Agility for movement and fire rate, Intellect for experience access, and Charisma for money or cooldown support.
Skill Tree Checklist and Reference
Use this checklist when planning a new Training allocation. It helps separate permanent progression decisions from temporary in-run choices.
Skill Tree Planning Checklist:
- Unlock the Training system after earning A Horrible Night to Have a Curse
- Identify whether survival, damage, growth, economy, or mobility is the current priority
- Spread early upgrade tiers when targeting a Team Level threshold
- Match the main category to the team’s weapon and ability profile
- Review thresholds after refunding or changing the build
The Upgrades page on the Yet Another Zombie Survivors Wiki provides the reference breakdown for the named skills, their effects, category costs, tiers, and Team Level requirements.
| Planning Question | Best Reference Point |
|---|---|
| How many skills exist? | 20 unique skills |
| How many categories are listed? | 5 categories |
| What does Endurance improve? | Starting health and damage resistance |
| What does Charisma improve? | Money collection and ability cooldown |
| What does Strength improve? | Weapon and ability damage |
| What does Intellect improve? | Experience collection and pickup range |
| What does Agility improve? | Movement speed and weapon fire rate |
Recommended Review Schedule
Review your allocation at three points:
- After unlocking the tree: Choose a direction based on your current survival and damage problems.
- At Team Level 10: Confirm that early spending has opened the later upgrade row.
- Before a specialized build: Respec if your permanent stats no longer match your preferred character combination.
A refund is most useful when it solves a clear problem. Avoid changing the tree after every difficult run; instead, identify whether the failure came from insufficient damage, poor positioning, a weak character combination, or a missing defensive stat.
Q: What is the Yet Another Zombie Survivors skill tree?
It is a team-wide Training system containing 20 permanent, refundable skills across five categories: Endurance, Charisma, Strength, Intellect, and Agility.
Q: How many Training Points are needed to unlock everything?
The listed upgrade tree requires 475 Training Points in total. Each of the five categories requires 95 points.
Q: How does Team Level work?
Team Level counts the total number of individual upgrade levels purchased. It is based on upgrade tiers, not the total number of points spent, and it gates later skills.
Q: Which category should I upgrade first?
Choose the category that addresses your biggest weakness. Endurance supports survival, Strength improves damage, Agility improves movement and fire rate, Intellect improves experience access, and Charisma supports money and cooldowns.
Start broadly, reach important Team Level thresholds efficiently, then specialize. The best skill tree allocation is the one that makes your chosen team more consistent without weakening its core strategy.