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Name   |
Combat Level |
Members Only | Number of Lifepoints |
XP | Slayer XP |
| Umbra (AoD) | 1000 | Yes | 300000 | 0 | 0 |
| Umbra (Weakened) | 750 | Yes | 150000 | 0 | 0 |
| Unstable glacyte | 114 | Yes | 5000 | 442 | 0 |
| Unspeakable horror (elite) | 112 | Yes | 30000 | Unknown | 1242 |
| Umbra | 111 | Yes | 10000 | 1443 | 0 |
| Ukunduka | 108 | Yes | 75000 | 1242 | 0 |
| Unspeakable horror | 105 | Yes | 13000 | 1428 | 440 |
| Undead Troll (level 95) | 95 | Yes | 3400 | 557 | 108 |
| Undead Troll (level 86) | 86 | Yes | 3100 | 415 | 81 |
| Undead Troll (level 81) | 81 | Yes | 2900 | 341 | 66 |
| Uodai | 75 | Yes | 2700 | 280 | 55 |
| Uyoro | 75 | Yes | 2700 | 267 | 53 |
| Undead Lumberjack | 74 | Yes | 120 | 12 | 0 |
| Unicow | 57 | Yes | 2050 | 145 | 0 |
| Undead one (level 46) | 46 | Yes | 1650 | 106 | 0 |
| Undead one (level 44) | 44 | Yes | 1600 | 101 | 0 |
| Unstable attendant | 31 | Yes | 2000 | 107 | 0 |
| Ugthanki | 28 | Yes | 1000 | 59 | 0 |
| Unicorn | 15 | No | 2100 | 45 | 0 |
| Unicorn foal | 8 | Yes | 750 | 36 | 0 |
| Undead Chicken | 7 | Yes | 700 | 36 | 7 |
| Undead Cow | 4 | Yes | 1100 | 33 | 6 |
| Ungadulu | 2 | Yes | 50 | Unknown | 0 |
| Undead Pekin | 1 | Yes | 700 | 33 | 0 |
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