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With the Lord of the Sea by our side, we have prevailed in battle! However, the Deep Devils may yet have the last laugh: they have awakened Leviathan, the evil deity of the depths they worship. If Leviathan attains its full power, there is nothing in the world that can stop it.
No time to regroup or recover, we must head into Leviathan's lair, the city of Ryly'eh, once the seat of Regnos' rule. It is time to defeat the Deep Devils and their malevolent god once and for all!

The Sunken Citadel is an elite stage in Kingdom Rush: Frontiers, and the third and final stage in the Rising Tides mini-campaign.

Campaign[]

Set-Up[]

Wave Composition[]

Wave Enemies
(West > South)
[Path]
Enemies
(West > South)
[Water]
Enemies
(North > South)
[Water]
Enemies
(North > South)
[Under Bridge]
Enemies
(North > Southeast)
[Path]
Income
1 Greenfin x12 Greenfin x16 560
2 Greenfin x12
Redspine x2
Greenfin x9 500
3 Greenfin x9 Greenfin x7 Greenfin x10
Redspine x1
560
4 Greenfin x14 Greenfin x3
Blacksurge x1
Redspine x4 550
5 Greenfin x12
Redspine x1
Greenfin x16
Blacksurge x2
700
6 Greenfin x9 Bloodshell x1 Deviltide x9 480
7 Redspine x3
Deviltide x6
Greenfin x8
Bluegale x1
460
8 Redspine x4 Blacksurge x1
Bloodshell x1
Greenfin x4
Bluegale x3
590
9 Greenfin x9 Greenfin x13 Greenfin x13 Greenfin x13 Greenfin x13 1220
10 Redspine x3
Bluegale x2
Redspine x2
Deviltide x8
Greenfin x9
Bluegale x2
780
11 Bluegale x3 Redspine x1
Bluegale x3
Redspine x1
Bluegale x3
620
12 Bloodshell x3 Bloodshell x2 600
13 Deviltide x9 Deviltide x13 Deviltide x13 Deviltide x13 Deviltide x13 1220
14 Greenfin x15
Deviltide x6
Blacksurge x3 Bluegale x1
Bloodshell x2
870
15 Bluegale x4 Bloodshell x1 Redspine x8
Bluegale x2
Redspine x2
Bluegale x1
Bluegale x1
Bloodshell x2
1240

Leviathan appears at the northeast corner to attack after wave 15. This is not counted as a wave.

- Enemies
(West > South)
[Path]
Enemies
(West > South)
[Water]
Enemies
(North > South)
[Water]
Enemies
(North > South)
[Under Bridge]
Enemies
(North > Southeast)
[Path]
Income
Boss fight Deviltide x21
Redspine x6
Bloodshell x5
Bluegale x1
Greenfin x10
Deviltide x4
Greenfin x20
Redspine x4
Deviltide x9
Bloodshell x5
Bluegale x1
3000

Strategy

General[]

This level is home to several powerful enemies with steep resistances. Great quantities of physical and magic damage are necessary if player is to pass this level (especially with 3 stars), but players can't afford to neglect stalling either. Fortunately, the Shrine of Regnos is a great help in dispatching stronger enemies, particularly when clumped together. It's too slow to be relied upon too much however, so players should hold off on investing in it until their setup is already reasonably solid.

Leviathan's tentacles will appear at several points in the level and wrap around your towers, disabling them. Because of this it's best to limit your use of costal strategic points to non-critical towers or barracks whenever possible. By the time he appears and the boss battle begins, you've already won. Leviathan himself has a relatively small health pool and any setup strong enough to survive the previous waves can easily dispatch him.

Upgrades and Hero[]

The water-covered portions of the map are impassible to most heroes, meaning they'll be restricted to the island on the bottom edge of the map, where they spawn. The only exceptions are those who can teleport (Nivus and Dierdre) and flying heroes (Ashbite and Bonehart) and Karkinos. The two dragons also deal almost exclusively True Damage, making them effective against the heavily armored Blacksurges and Bloodshells and the magic-immune Bluegales. They even expedite the boss fight by flying to Leviathan when he appears and attacking directly.

Towers[]

Necromancers may be a tempting choice due to their mix of damage and stalling power, but be wary. The skeletons they summon have little health and can easily be wiped out by Bluegale's storms, but they are very effective for stalling enemies like Greenfins in earlier rounds.


High level barracks, particularly tier 4 barracks towers are recommended. Assassin's Guild is very useful against stronger enemies like Bloodshells, Redspines and Blacksurges since they are capable enough of dodging attacks and plus if player decides to upgrade them with Counterattack, they can significantly increase dodge chance ( 70% chance at highest level) and also doing that, players can increase damage too. Sneak Attack is another highly useful upgrade, since with it, players are able to instantly kill enemies with chance that varies from 3-5%, which may seems like a small chance, but keep in mind that there are 3 Assassins, which means that Instant Kill chance is tripled. Also, even if Sneak attack fails, it will deal good amount of True Damage.


One Tribal Axethrower tower per choke point can also provide a much-needed boost to DPS and mitigate the impact of Blacksurges' and Bluegales' special abilites with Totem of Spirits and they can increase damage dealt to enemies with Totem of Weakness which is very useful for enemies like Bloodshells and Bluegales.


Artillery towers are not recommended for this stage !

Heroic Challenge[]

Set-Up[]

Wave Composition[]

Wave Enemies
(West > South)
[Path]
Enemies
(West > South)
[Water]
Enemies
(North > South)
[Water]
Enemies
(North > South)
[Under Bridge]
Enemies
(North > Southeast)
[Path]
Income
1 Greenfin x12 Greenfin x12 480
2 Deviltide x16 Greenfin x16 Greenfin x12 880
3 Greenfin x10 Greenfin x12 Redspine x2 Deviltide x10 720
4 Deviltide x11 Bluegale x2 Greenfin x13 Blacksurge x1 Bloodshell x1 770
5 Bloodshell x1 Bluegale x4 Greenfin x21 780
6 Bloodshell x2 Bluegale x3 Greenfin x19 Blacksurge x2
Greenfin x3
Bloodshell x2 1200

Strategy

General[]

Upgrades and Hero[]

Towers[]

Iron Challenge[]

Set-Up[]

Wave Composition[]

Wave Enemies
(West > South)
[Path]
Enemies
(West > South)
[Water]
Enemies
(North > South)
[Water]
Enemies
(North > South)
[Under Bridge]
Enemies
(North > Southeast)
[Path]
Income
1 Blacksurge x7
Bluegale x3
Bloodshell x1
Greenfin x15
Bluegale x2
Blacksurge x7
Redspine x2
Greenfin x4
Bloodshell x3
Bluegale x2
Greenfin x33 Greenfin x88 4480

Strategy

General[]

Upgrades and Hero[]

Towers[]

Related Achievements[]

3Squid.png SQUID IN ITS INK Defeat Leviathan, the Underwater God.

Trivia[]

  • The name of the city, Ryly'eh, is a reference to R'lyeh, the nightmare corpse-city that appears in the H. P. Lovecraft short story The Call of Cthulhu, where Cthulhu sleeps, dreaming.
  • On the map, the level flag is placed on a location named Mompoey Island, which is named after Pablo Realini Mompoey, one of the co-founders of Ironhide Game Studio.
  • On the beach near the water-side exit flag, is a half-buried stone hand. This is a reference to a famous sculpture called The Hand by Chilean artist Mario Irarrázabal. It is located in Punta del Este, in Uruguay, which is where Ironhide Game Studio is based.
  • The level preview shows a slightly different layout to the level as it is actually presented. "The Hand" is located on the beach near the land exit in the preview, whereas in the gameplay level it has moved over to the right, away from the battle. Its repositioning suggests that another Strategic Point was needed.
Levels • Kingdom Rush
Main Campaign SouthportThe FarmlandsPagrasTwin RiversSilveroak ForestThe CitadelColdstep MinesIcewind PassStormcloud TempleThe WastesForsaken ValleyThe Dark Tower
Elite Ruins of AcarothSarelgaz's LairRotten ForestFungal ForestHushwoodBandit's LairGlacial HeightsHa'Kraj PlateauPit of FirePandaemoniumRotwickAncient NecropolisNightfang SwaleCastle Blackburn
Endless Rage Valley
Levels • Kingdom Rush: Frontiers
Main Campaign HammerholdSandhawk HamletSape OasisDunes of DespairBuccaneer's DenNazeru's GatesCrimson ValleySnapvine BridgeLost JungleMa'qwa UrquTemple of SaqraThe UnderpassBeresad's LairThe Dark DescentEmberspike Depths
Elite Port TortugaStorm AtollThe Sunken CitadelBonesburgDesecrated GroveDusk ChateauDarklight Depths
Endless Ruins of Nas'DeTemple of Ethereal Evil
Levels • Kingdom Rush: Origins
Main Campaign Gray RavensThe High CrossWaterfall TrailsRedwood StandRoyal GardensGryphon PointRockhengeGrimmsburgThe Crystal LakeNeverwonderThe Unseelie CourtThe AscentArcane QuartersMactans' RetreatShrine of Elynie
Elite Galadrian's WallBlood QuarryBeheader's SeatDuskwood OutpostDuredhel OutskirtsDwaraman GatesTainted Pit
Endless Valor's RestTwilight Invasion
Levels • Kingdom Rush: Vengeance
Main Campaign Vez'nan's TowerDwarven GateCorridors of the Old CityKazan MinesGolden BreweryClockwork FactoryBolgur's ThroneNortherners' OutpostFrozen RapidsNortherners' VillageDragons' BoneyardJokull's NestOtil FarmlandsSilveroak OutpostCity of LozagonLightseeker CampDenas's Castle
Elite Maginicia ShoresAnurian PlazaPond of the SageBreaking the IceInto the MountainsThe Frozen ThroneBack To The Rotten ForestA Night In The SwampThe Ancient Ghosts
Endless
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