How it works
Once a character finishes the 4th class upgrade, it can open the Skill Enhance Tree with Ctrl+A or with the Skill Enhance button in the Character Info window. From then on every level up gives one point to spend here. It follows the Master Skill Tree of the 3rd class.
Each class has a set list of main skills it can enhance. An enhanced skill replaces the normal one, and the options you buy around it only work for that main skill, not for your other skills.
Skill enhancement options
| Option | Effect on the main skill |
|---|---|
| Skill Damage Increase | Adds to the final damage of the skill. |
| Damage Count Increase | The skill hits more times. |
| Increase Additional Damage Rate | Chance of extra (yellow) damage. |
| Increase Attack Speed | The skill is cast faster. |
| Increase Attack Range / Skill Range | Wider area, or reach targets farther away. |
| Additional Splash Damage | Hits monsters within 1 tile of the target. |
| Increase Target | More targets for area attacks. |
| Cooldown Time Reduction / Remove Cooldown Time | Shorter or no cooldown. |
| Weapon Damage / MP Increase (%) | Raises the equipped weapon's damage or MP by a percent. |
Debuffs and explosion skills
Each main skill is linked to two debuff types. Spend 10 points in the first skill slot and a [ ? ] icon lights up; click it to pick which debuff to enhance. Raising the debuff rate makes the skill apply the basic debuff more often, and raising the upgrade rate can turn it into a stronger version while the basic one is still on the target.
| Basic debuff | Upgraded | Explosion skill | Explosion effect |
|---|---|---|---|
| Poisoning | Deadly Poison | Poison Storm | Damage, and spreads poison to nearby monsters |
| Chilling | Freezing | Frozen Slayer | Damage, plus splash to monsters around |
| Bleeding | Hemorrhage | Bloodying Hit | Damage, and lowers the target's DEF for a while |
| Shock | Stun | Stun Boom | Damage, and blinds the target for 2 seconds |
- A target can carry 4 debuffs in total.
- An explosion skill only works on a target under the upgraded debuff. It removes that debuff, so you can apply it again.
- Monsters have debuff resistance: a 45% debuff rate against 10% resistance gives the example result of 30% in the official guide. Damage-type debuffs are also reduced by the monster's debuff DEF.
| Class | Main skill | Debuffs |
|---|---|---|
| Dark Knight | Blow | Bleeding / Chilling |
| Dark Wizard | Meteor Strike | Shock / Bleeding |
| Elf | Multi-Shot | Shock / Poisoning |
| Summoner | Fire Beast | Poisoning / Shock |
| Dark Lord | Fire Burst | Poisoning / Bleeding |
| Rage Fighter | Dragon Roar | Poisoning / Chilling |
| Magic Gladiator | Gigantic Storm | Chilling / Poisoning |
| Grow Lancer | Shining Peak | Chilling / Poisoning |
Side options
Passive side options unlock from the total points you have put into the skill slot or the debuff slot. Each opens in three stages, and each stage lets you add 10 more points, up to 30.
| Option | Slot | Stage 1 | Stage 2 | Stage 3 |
|---|---|---|---|---|
| Increase Max HP | Skill | 20 | 45 | 65 |
| Add Variable Stat | Skill | 40 | 80 | 120 |
| Increase Basic DEF | Skill | 60 | 100 | 140 |
| Increase DMG (or Magic) | Debuff | 10 | 35 | 60 |
| Add Variable Stat | Debuff | 30 | 70 | 110 |
| Increase Skill DMG | Debuff | 50 | 90 | 130 |
Stage numbers are total points spent in that slot. Increase Basic DEF cannot be pierced by effects such as Enemy DEF Ignore. The DMG option goes to Dark Knight, Elf, Dark Lord, Rage Fighter and Grow Lancer; Dark Wizard and Summoner get Magic, and the Magic Gladiator gets both.
The 4th stat option
- Add Variable Stat gives points you can put straight into Strength, Agility, Vitality (HP) or Energy. These raise your base stats but do not count toward item equip requirements.
- Every 8 variable stat points use 1 Skill Enhance Tree point. An update made it possible to add them in multiples of 8 in one go: left click changes the value by 1, right click by 8.
- The Dark Lord can also pick Command as a variable stat.
- Variable stats from this option reset when the Skill Enhance Tree is reset.
Sources
- MU Online official guide: 4th Class Skill
- MU Online official guide: Skill Enhance System
- MU Online official guide: Skill Enhancement Tree - 4th Stat Option Improvement
Game pictures: © Webzen Inc. · muonline.webzen.com
