Undead Siege

Undead Siege is a Zombies mode featured in Call of Duty: Mobile. Undead Siege is based on the "Seven Days of Siege" mode from Call of Duty: OnlineCall of Duty: Online Seven Days of Siege gameplay with elements of the Outbreak mode from Call of Duty: Black Ops Cold War.
Taking place on a section of the Isolated map from the Battle Royale mode, as well as Blackout from the titular Black Ops 4 mode, Undead Siege features several enemies, objectives to complete and rewards to unlock. The mode also takes elements from the Treyarch series of Zombies by primarily featuring items such as Perk-a-Cola machines alongside the wooden Mystery Box.
The mode was originally released on August 1st, 2021 as part of Season 6: The Heat update before being removed on September 23rd, 2021 with Season 8: 2nd Anniversary. The mode returned on October 20th, 2021 as part of Season 9: Nightmares and was removed on November 16th, 2021 with Season 10: Shadows Return. The mode was brought back yet again on December 17, 2021 as part of Season 11: Final Snow, this time with a third mode, Nightmare mode, new blueprints and a character skin in Richtofen's Rewards, and a raise to the talent level cap. The mode was removed on May 31, 2022 with Season 5: Tropical Vision and brought back on October 19, 2023 with Season 9: Graveyard Shift.
== Gameplay ==
A game of Undead Siege consists of day and night system, and both phases last a few minutes. During the day, the players can explore and collect loot and guns for the upcoming night. When there are 20 seconds left in the day, the player will be automatically teleported back to the "teleportation base," so wandering too far is not a worry. At night you have to protect the base at night by placing turrets that automatically target zombies, repair the teleporter with your wrench, and share materials with your teammates in the warehouse. If the teleporter gets destroyed by the zombies, you lose. The teleporter also comes with a vending machine which you can purchase custom weapons, more ammo, or powerful items like the XS1 Goliath using Aether essence collected from shooting zombies. There are also ability amplifying drinks similar to Shi No Numa. 
===Side Missions===
On Hard and Nightmare Mode, after the second, third and fourth night, players will be able to complete side missions. There are multiple side missions, which are:
*Escorting Dempsey as he drives a truck full of Aether Crystals, and preventing any zombies from getting in close proximity.
*Destroying an Infection Source, which is a giant Aether Crystal.
*Killing the Butcher Boss from the standard Battle Royale.
*Feeding Ceberus by luring zombies into circle in front of it and kill them.
Missions can only be accepted with a limited time frame, but are reasonably close to the base, about 200 meters away, though some can spawn up to 1200 meters away. Side missions, when completed, reward a large amount of loot, including ammunition, turret materials, and weapons. If side missions are failed (by not completing the objective in time), they will spawn smaller amounts of loot, and the said loot will usually not be as valuable as a completed mission's loot.
=== Defending the Base ===
During the night, a specified area around the teleportation base will be safe from the surrounding radiation storm, stepping out into storm for too long will gradually kill the player (health decay in the storm at the rate of 10/sec). During this time, players can use the loot they've acquired to build turrets than can assist in eliminating zombie threats, and said turrets can be modified and upgraded up to three times in casual difficulty and four times in hard and nightmare difficulty. Players can also buy items from the base like light and heavy ammo, a war machine, a Death Machine, XS1 Goliath and custom weapons similar to Battle Royale.
Depending on difficulty, the game will last for 3 days and nights on Casual mode and for 5 on Hard and Nightmare mode. In Hard mode, players will encounter specialized zombies much sooner and in greater numbers, thus necessitating strategy and careful usage of turrets to win. The game ends when the player has survived all nights, or the base is destroyed.
From 2021 Season 11, the mode receives new difficulty, Nightmare, where zombies in general will be tougher, special ones will come earlier than normal (and in larger numbers), and normal zombies can become dangerous foes due to them having a number of Wild Cards that grant them an overall advantage over players. Wild Cards occur after the half-point of each night and give all zombies a random buff, such as a speed boost, attack boost, or being able render turrets less effective. However, players will also get access to a new turret tier (Legendary) and new ground-loot weapons (Ray Gun, Tempest) that require Ballistic Expert, which can be either looted or purchased from the Vending Machine.
Mystery Boxes can be found throughout the map as of 2021 Season 11, indicated by their signature blue beam of light.
Perk-a-Colas are immediately near the base, and mostly within the protective circle. The following perks can be found:
*Quick Revive
*Stamin-Up
*Deadshot Daiquiri
*Electric Cherry
*Speed Cola
From 2021 Season 11, the Pack-a-Punch Machine was added, and it can be found around the base. All weapons can be Pack-a-Punched a maximum of 5 times. From 2023 Season 9 Pack-a-Punch Machine only appears in Nightmare mode.
The player has a wrench by default that can heal both the base and turrets erected by themselves or teammates. It can also be used as a melee weapon against zombies and hitting it on a turret that is upgrading will make the turret upgrade faster.
At the end of each match, players will be awarded with varying drops depending on the mode, though there is a chance player may not get a reward, such as when you leave the game. If players leave the game, they will receive a portion of the EXP towards their Battle Pass, but have a high chance of not getting any reward drops.
===Talents===
Talents are a unique feature that upgrade various aspects, including:
Talents 	Turret Weapon 	Turret Armor 	Weapon Upgrade 	Toughness 	Advanced Tools
Upgrade Info	Increases Turret Damage 	Increases Turret Health 	Increase damage dealt by weapons 	Increase base health 	Increase HP recovers for turrets per Wrench attacks
Lv. 10 Trait	When turret's health falls below 35%, attack speed is increased by 50%. 	When turret's health is lower than 35%, the damage received is reduced by 50%. 	Increase magazine capacity and reload speed for all firearms. 	Significantly increases player's movement speed. 	Increases the attack speed of the Wrench.
Lv. 15 Trait	When you have 2 or more Laser Turrets, fire rate for all turrets increases by 20%.	When you have 2 or more Fire Grenade Turrets, damage for all turrets increases by 100%.	When you have 2 or more Sentry Turrets, damage to the Zombies increases by 15%. 	Reduces HP recovery time. 	When you have 2 types of turrets, repair increases by 50%.
Lv. 20 Trait	When you have 4 or more Laser Turrets, fire rate for all turrets increases by 50%.	When you have 2 or more Tar Grenade Turrets, the explosion damage is increased. 	When you have 2 or more Sentry Turrets at max level, damage to the Zombies increases by 30%.	Players in the Control Center will recover HP a little faster.	When you have 4 types of turrets, repair increases by 100%.
All upgrades however will require Aether materials, but that can be obtained in normal gameplay or through the Richtofen's Rewards system.
The original talent level cap was 10, but with 2021 Season 11, this has been expanded to 20. Depending on the talent, every five levels after getting a talent to level 10 will grant a special trait. Traits relating to turrets can conflict with one another, as some traits may require all of the player's turrets to be a single type to grant the trait's full bonus. Some traits are completely neutral however, such as a health regeneration boost while inside of the protective sphere of the base.
===Richtofen's Rewards===
Completing various challenges will earn XP for Richtofen's Rewards. It has 50 tiers (+30 from Season 11 (2021)) and consists of Uncommon and Rare camos, Aether materials, Epic skins and blueprints.
=== Map ===
The map of the game mode is a modified version of Isolated, which has a smaller play zone and features Infected Areas, which usually contain more loot, as well as more zombies. In 2021 Season 11, the mode's location has changed to a portion of Blackout, with similar location types to the original Isolated map. In 2023 Season 9, the Blackout map was removed and the Modified version of Isolated map was brought back.
===Easter Egg===
The mode has one easter egg which involves the players accessing various computers with varied passwords in Isolated. After unlocking a computer, they will unlock an entry concerning various zombie types. They will also be rewarded with some turret materials.
Computers can be found in:
*Sakura - Inside of a dark red house, which is near the center of the area, on the bottom floor. The password is 0418
*Outpost - Inside of a faded green house, second house north from the water on the left side. Also found on the bottom floor. The password is 6682
*Nuclear Plant - Inside the building south of the reactor on the west side, and on the bottom floor. The password is 7529
*Sanitarium - Inside on the bottom floor on the Help Desk. The password is 4689
=== Turrets ===
Common 	Sentry
*500 Aether Essence	Sentry
*500 Aether Essence	Sentry
*500 Aether Essence	Sentry
*500 Aether Essence	Sentry
*500 Aether Essence	Sentry
*500 Aether Essence	Sentry
*500 Aether Essence	Sentry
*500 Aether Essence
Uncommon 	Sentry II
*1000 Aether Essence
*2x Pedestal Lv.1	Sentry II
*1000 Aether Essence
*2x Pedestal Lv.1	Sentry II
*1000 Aether Essence
*2x Pedestal Lv.1	Sentry II
*1000 Aether Essence
*2x Pedestal Lv.1	Grenade
*1000 Aether Essence
*2x Pedestal Lv.1	Grenade
*1000 Aether Essence
*2x Pedestal Lv.1	Grenade
*1000 Aether Essence
*2x Pedestal Lv.1	Grenade
*1000 Aether Essence
*2x Pedestal Lv.1
Rare 	Heavy Sentry
*1500 Aether Essence
*3x Pedestal Lv.1
*2x Machine Gun Mod	Heavy Sentry
*1500 Aether Essence
*3x Pedestal Lv.1
*2x Machine Gun Mod	Laser
* 1500 Aether Essence
* 2x Pedestal Lv.1
* 3x Laser Mod	Laser
* 1500 Aether Essence
* 2x Pedestal Lv.1
* 3x Laser Mod	Grenade II
*1500 Aether Essence
*3x Pedestal Lv.1
*2x Grenade Mod	Grenade II
*1500 Aether Essence
*3x Pedestal Lv.1
*2x Grenade Mod	Fire Grenade
*1500 Aether Essence
*2x Pedestal Lv.1
*3x Grenade Mod	Fire Grenade
*1500 Aether Essence
*2x Pedestal Lv.1
*3x Grenade Mod
Epic 	Heavy Sentry II
* 2500 Aether Essence
*3x Pedestal Lv.2
*1x Machine Gun Mod	Cannon
* 2500 Aether Essence
*1x Pedestal Lv.2
* 3x Machine Gun Mod	Laser II
*2500 Aether Essence
*3x Pedestal Lv.2
* 1x Laser Mod	Thunder
*2500 Aether Essence
* 1x Pedestal Lv.2
*3x Laser Mod	Double Grenade
*2500 Aether Essence
*3x Pedestal Lv.1
*1x Grenade Mod	Missle
*2500 Aether Essence
*1x Pedestal Lv.2
*3x Grenade Mod	Fire Grenade II 
*2500 Aether Essence
*3x Pedestal Lv.2
*1x Flames Mod	Tar Grenade
*2500 Aether Essence
*1x Pedestal Lv.2
* 3x Flames Mod
Legendary	Heavy Sentry III
*3500 Aether Essence
*3x Pedestal Lv.2
*5x Machine Gun Mod	Cannon II
* 3500 Aether Essence
* 3x Pedestal Lv.2
* 5x Sentinel Mod	Laser III
*3500 Aether Essence
*3x Pedestal Lv.2
*5x Laser Mod	Thunder II
*3500 Aether Essence
*3x Pedestal Lv.2
*5x Rumble Mod	Double Grenade II
*3500 Aether Essence
*3x Pedestal Lv.2
*5x Grenade Mod	Missle II
* 3500 Aether Essence
* 3x Pedestal Lv.2
*5x Missle Mod	Fire Grenade III
*3500 Aether Essence
*3x Pedestal Lv.2
*5x Flames Mod	Tar Grenade II
*3500 Aether Essence
*3x Pedestal Lv.2
*5x Tar Mod
==Features ==
*Teleportation Base
*Turrets, which can be upgraded using turret materials into various forms.
*Perk-a-colas and Pack-a-Punch machine now spawn around the Teleportation Base.
*Daytime Side Missions
*Ammo can be bought in the Teleportation Base.
*Rideable vehicles (disabled during nighttime)
===Weapons===
Starting Weapons
Wrench model CoDMobile.png|Wrench
Ground Loot
M4 model CoDM.png|M4
AK117 model CoDM.png|AK117
AK-47 Gunsmith CoDM.png|AK-47
AKS-74U model CoDMobile.png|RUS-79U
MSMC model CoDMobile.png|MSMC
ICR-1 Gunsmith CoDM.png|ICR-1
DR-H model CoDMobile.png|DR-H (Daytime Side Mission)
CR-56 AMAX Gunsmith CoDM.png|CR-56 AMAX
QQ9 model CoDMobile.png|QQ9
QXR model CoDMobile.png|QXR
HS2126 model CoDMobile.png|HS2126
M4LMG model CoDMobile.png|M4LMG
S36 Gunsmith CoDM.png|S36
Chopper Gunsmith CoDM.png|Chopper (Daytime Side Mission)
Echo model CoDMobile.png|Echo
Holger 26 Gunsmith CoDM.png|Holger 26
SP-R 208 model CoDMobile.png|SP-R 208 (Daytime Side Missions)
DL Q33 Gunsmith CoDM.png|DL Q33
.50 GS model CoDMobile.png|.50 GS
Renetti model CoDMobile.png|Renetti
File:L-CAR 9 model CoDMobile.png|L-CAR 9
File:Fennec model CoDMobile.png|Fennec
File:KRM-262 model CoDM.png|KRM-262 (Daytime Side Missions)
File:Oden model CoDMobile.png|Oden
Ray Gun ShiNoNuma COD Mobile Zombies.PNG|Ray Gun
Tempest model CoDMobile.png|Tempest
Special Weapons
Death Machine model CoDMobile.jpg|Death Machine - 3000 points
War Machine model CoDMobile.png|War Machine - 2000 points
XS1 Goliath model CoDMobile.png|XS1 Goliath - 6000 points
==Plot==
===Comics===
Undead Siege also features comics, similar to that of the normal Battle Pass, except these focus after Tank Dempsey's funeral. After his funeral, the Primis crew lament his loss, and due to them being unable to progress without him, they begin to seek out another Dempsey to replace him, who ends up difficult to find alive and difficult to keep alive.
When they finally are able to recruit a Dempsey, he is in disbelief of what the Primis group has told him, and Richtofen attempts to prove it using the Summoning Key. However, it fails, and the Primis group is surrounded by zombies.
===In-Game ===
The player has been sent into a section of the Battle Royale map, Isolated or Blackout, which has been corrupted by the Aether, and is about to be shot before Primis Richtofen confronts the player. He gives them a choice, to help the Primis crew or die. The player chooses the former, and over time, learns that due to Takeo being injured, the crew is overwhelmed, and that Richtofen is doing his best to get back to their "home," though what this refers to is unknown. Although the general plot is the same, helping the Primis Crew escape with their teleporter, depending on mode there can be extra dialogue, usually in Hard Mode rather than Casual Mode.
In Hard Mode, it is stated by Richtofen during the third and fourth nights that something or someone may be keeping the Primis group inside of Isolated. However, this is not explored further as Richtofen and the others are presumed to have escaped after the fifth night.
==Transcripts==
==Gallery==
Undead Siege Promo CODM.jpg
Undead Siege Promo2 CODM.jpg
Undead Siege Promo3 CODM.jpg
Undead Siege Promo4 CODM.jpg
Undead Siege Promo5 CODM.jpg
==Videos==
Call of Duty®- Mobile - Unidentified Anomaly
Call of Duty®- Mobile - Unidentified Broadcast
Call of Duty®- Mobile - Announcing Undead Siege
Call of Duty®- Mobile - Strategize to Survive - Undead Siege
Call of Duty®- Mobile - Day 0 Night 0
Call of Duty®- Mobile - Official Undead Siege Trailer
Call of Duty®- Mobile - Undead Siege Returns - Season 11
==Trivia==
*Despite being listed in Weapon Camos section, all Launchers, along with their ammo, aren't available for use.
*Before Season 10 2022, there was a bug that player can access Undead Siege by simply finding weapons that don't have Aether Crystal camo. But after Season 10 update, the bug got patched out.
==References==
Category:Call of Duty: Mobile Zombies Gametypes