Underwater City/Guide
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This content is part of the Atlas of Discovery Expansion.
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| This page is up to date (v1.2.2). |
Underwater City
Introduction
This is a Barrier dungeon introduced with the 
Atlas of Discovery Expansion, there is a general guide to this dungeon and a more in-depth look into Barrier combat in general in this guide. This page will go deeper into combat options, including when 
Throne of the Herald Expansion is owned and already completed.
This guide is not meant for optimal kills per hour but instead focuses on easily obtainable ways ranging from just passed God Dungeons to having beaten 
Throne of the Herald to clear the dungeon effectively.
Requirements
- Complete
Cult Grounds - Discover
Melantis 
Damage Reduction Potion IV
Recommended
Level 99, 
Level 95, 
Level 75, 
Level 99.
The enemies, and especially the 
Nagaia hit very hard in this dungeon. A lot of damage reduction is required in order to idle this dungeon without dying. Alternatively, the player can return after having progressed through the Throne of the Herald expansion. Having more hitpoints or other damage reducing and damage inflicting bonusses can greatly speed up the clear times of this dungeon. Set 1 clears the dungeon roughly 27 times per hour. Set 2 clears it roughly 8.5 times per hour. (You can swap the weapon & summons in Set 2).
The Preferred Shield is 
Earth Layered Shield, however 
Devouring Barrier Shield can be used, once the upgrade item has been obtained from this dungeon.
Clearing the Underwater City dungeon provides 1 
Barrier God Shard every time it is cleared. These can be used to upgrade (B) god armours into their respective (C) armours. These can then be used to very effectively clear 
Crystal Depths for 
Crystal Binding Dust if the player hasn't already done this.
Equipment
Below are 2 sets, unlike the previous dungeons, you can't mix and match this dungeon. Set 1 is for post-TotH clears. Set 2 is for clears just before or after 
Impending Darkness Event.
Set 1 requires Level 120.
Set 2 requires a minimum of Level 99. Calculated at all combat skills level 99 in the Combat Simulator.
Set 2 can be all non-B upgraded Terran God Armour and it will only lower the Kills Per Hour by about 2 (from 8.5 to 6.5).
Prayers: 
Battleheart and 
Battleborn. Swap to Battleheart and 
Chivalry for Set 2.
Potion: Damage Reduction Potion IV
Point of Interest: 
Dark Waters
Agility
The Agility obstacles 9 or higher are not required, 8 and below are highly suggested (and simulations were done with those active).
| Slot | Obstacle | Bonuses |
|---|---|---|
| 1 | Cargo Net | +3% Global GP (except Item Sales) +2% Fishing Mastery XP |
| 2 | Monkey Bars | -4% Firemaking Interval |
| 3 | Pipe Climb | +5% Melee Evasion +5% Melee Maximum Hit |
| 4 | Cave Climb | -40 Maximum Hitpoints +5% Melee Maximum Hit +5% Rune Preservation +5% Ammo Preservation |
| 5 | Cliff Balance | +5% Ranged Accuracy Rating +5% Magic Accuracy Rating +5% Melee Accuracy Rating +20 Maximum Hitpoints +2 Prayer Point Cost for Prayers |
| 6 | Lake Swim | +1% Damage Reduction +5% Damage To All Monsters +3% Chance To Preserve Prayer Points |
| 7 | Boulder Trap | -20% Chance to Preserve Resources in Skills |
| 8 | Raft Building | +1% Damage Reduction +20 Maximum Hitpoints +2% Damage To All Monsters |
| 9 | Ice Jump | +10 Mining Node Hitpoints +10% Chance to Preserve Resources in Skills +5% Chance to Double Items Globally +5% Food Healing Value +20 Maximum Hitpoints |
| 10 | Dragon Fight | -16% Auto Eat Efficiency -0.3s Monster Respawn Timer |
| 11 | Frozen Maze | -20% Rune Preservation -0.1s Monster Respawn Timer +1% Damage Reduction -3 Prayer Point Cost for Prayers (Prayer Point cost cannot go below 1) -20% Ammo Preservation |
| 12 | Boulder Balance | -20% Global Accuracy +5% of Maximum Hit added to Minimum Hit -0.1s Attack Interval |
| 13 | Balance Trap | +10% Agility Interval +5% Chance to Double Items Globally -30% GP From Agility |
| 14 | Freezing Climb | -6% Chance To Double Loot in Combat +30% Accuracy Rating -150% GP From Monsters +30% Global Evasion +15% Damage To Dungeon Monsters |
| 15 | Waterfall Crossing | Your Attacks now roll twice (Select highest chance) -100 Maximum Hitpoints -10% Slayer Coins |
| Pillar | Pillar of Combat | +10% Magic Evasion +10% Ranged Evasion -0.2s Monster Respawn Timer +10% Melee Evasion +5% of Maximum Hit added to Minimum Hit +5% Flat Slayer Area Effect Negation +10 Flat Hitpoints Regeneration |
| Elite Pillar | Elite Pillar of Expertise | +8% Chance to Double Items Globally -3% Interval for all non-Combat Skills +40% Global GP (except Item Sales) +8% Global Mastery XP |
| Melvor Idle version v1.2.2 (Released: 15th November 2023) | |||||||||||||||||||
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| Reference Tables: Items, Equipment, Experience Table, Upgrading Items, Combat Areas, Slayer Areas, Dungeons, Chest Loot Tables, Monsters, Monster Loot Tables |
