| Name | Attribute | Level | Type |
|---|---|---|---|
| Undead Puppet | 110 | Elite Monster | |
| Undead Prowler | - | 1 | General |
| Undead Prowler | 44 | General Monster | |
| Undead Prowler | - | 5 | General |
| Undead Pirate Captain Yamar | 76 | Boss Monster | |
| Undead Pirate | 76 | General Monster | |
| Undead Maniac | 43 | General Monster | |
| Undead Mage Golgoroth | - | 1 | General |
| Undead Mage Golgoroth | 44 | Boss Monster | |
| Undead Knight | 57 | General Monster | |
| Undead Knight | - | 60 | General Monster |
| Undead Guard | 86 | Elite Monster | |
| Undead Guard | 86 | Elite Monster | |
| Undead Fangbat | 57 | General Monster | |
| Undead Corpse | 85 | General Monster | |
| Undead Corpse | 85 | General Monster | |
| Undead Armor | - | 1 | General Monster |
| Undead | - | 61 | Elite Monster |
| Uncontrollable Zaro | 60 | Boss Monster | |
| Uncontrollable Zaro | 60 | Boss Monster | |
| Uncontrollable Samuel | 62 | Boss Monster | |
| Uncontrollable Samuel | 50 | World Boss | |
| Uncontrollable Samuel | 62 | Boss Monster | |
| Uncontrollable Sakura | 62 | Boss Monster | |
| Uncontrollable Sakura | 62 | Boss Monster | |
| Uncontrollable Rita | 62 | Boss Monster | |
| Uncontrollable Rita | 62 | Boss Monster | |
| Uncontrollable Gaia | 62 | Boss Monster | |
| Uncontrollable Gaia | 62 | Boss Monster | |
| Uncontrollable Fina | 60 | Boss Monster | |
| Uncontrollable Fina | 60 | Boss Monster | |
| Uncontrollable Duo | 60 | Boss Monster | |
| Uncontrollable Duo | 60 | Boss Monster | |
| Uncontrollable Duet | 62 | Boss Monster | |
| Uncontrollable Duet | 62 | Boss Monster | |
| Uncontrollable Claire | 61 | Boss Monster | |
| Uncontrollable Claire | 61 | Boss Monster | |
| Uncontrollable Azusa | 62 | Boss Monster | |
| Uncontrollable Azusa | 62 | Boss Monster | |
| Uncontrollable Alice | 61 | Boss Monster | |
| Uncontrollable Alice | 61 | Boss Monster | |
| Uncontaminated grass. | - | 1 | Interactive |
| Unconscious Troll | - | 1 | General |
| Unconscious Soldier | - | 1 | General |
| Unconscious Orc | - | 1 | General |
| Unconscious Kormorant | - | 1 | General |
| Uncle | - | 1 | Interactive |
| Unbeatable Combination | - | 1 | General |
| Unable to connect. | - | 1 | General |
| Umbral Lamassu | 55 | General Monster |