How to Unlock All Universal Tower Defense Z New Units: Complete Update 4 Guide

Discover how to unlock all 25 Universal Tower Defense Z new units in Update 4, including secret, mythic, and Marvel crossover characters.

The massive Update 4 has officially arrived, bringing an absolute haul of fresh content for players to grind. If you are looking to optimize your squad, tracking down all the Universal Tower Defense Z new units is your top priority. This update introduces a staggering 25 new characters to collect, ranging from elusive secrets to summer event exclusives. In this comprehensive guide, we will break down exactly how to acquire all the Universal Tower Defense Z new units so you can dominate the battlefield.

Whether you are aiming for high-tier anime legends or specialized crossover heroes, this update has something for everyone. We will cover the specific game modes, drop rates, and evolution paths required to complete your collection. Let's dive into the details of this major content drop on the Roblox platform.

Unlocking the Secret Units in Update 4

Secret units represent some of the most powerful and sought-after characters in the game. In Update 4, developers have hidden these units behind specific high-level challenges, evolution systems, and rare game mode drops.

When hunting down the Universal Tower Defense Z new units, the secret tier represents the ultimate test of a player's roster strength. You will need to farm specific legendary stages, participate in raids, and gather evolution materials to unlock them.

Drill Hero Spiral

Drill Hero Spiral is a powerhouse unit inspired by classic mecha anime. To obtain this character, you must challenge the Legend Mode. Specifically, you need to complete the Beast Desert Legends stage, progressing all the way through Act 3. The final act of this stage gives you a chance to acquire Drill Hero Spiral upon successful completion.

Ice Queen Evo

Ice Queen Evo is an evolved unit that cannot be pulled directly from standard banners. Instead, you must first summon the base Rukia unit from the banner. Once you have the base unit, you can evolve her into Ice Queen White Haze (Ice Queen Evo). This process requires specific evolution materials that you can gather throughout the game's various modes.

Flame Captain Embers

Flame Captain Embers, heavily inspired by the legendary captain Yamamoto, is locked behind the Reaper City Raid. Players must queue up for this raid and complete the final stages to secure this flame-wielding powerhouse. Community reports suggest that having a strong support team is vital for clearing this raid efficiently.

Light Prince Ascension

Light Prince Ascension, which players associate with the character Uryu, is obtainable by playing the Hollow Destroyer versus Reapers game mode. This specialized mode requires careful positioning and strong wave-clear units to survive the onslaught and claim the reward.

The King

The King, modeled after Yhwach (Yuhaba), is tied to the Universal Tear. You must challenge this rift-based game mode to earn him. According to player experience, the drop rates in the Universal Tear can be challenging, meaning you may need to run this mode multiple times before seeing the unit drop.

Secret Unit	Anime/Marvel Inspiration	Primary Acquisition Method	Specific Stage/Requirement
Drill Hero Spiral	Simon / Gurren Lagann	Legend Mode	Beast Desert Legends (Act 3)
Ice Queen Evo	Rukia Kuchiki	Character Evolution	Evolve base Rukia from Banner
Flame Captain Embers	Genryusai Shigekuni Yamamoto	Raid Drop	Reaper City Raid (Final Stage)
Light Prince Ascension	Uryu Ishida	Special Game Mode	Hollow Destroyer vs Reapers
The King	Yhwach (Yuhaba)	Tear / Rift Mode	Universal Tear

Marvel Crossover and Extraction Game Mode Units

One of the most exciting additions in Update 4 is the inclusion of comic-inspired crossover units. These characters are housed in the Extractions game mode, which acts as a specialized farming zone for players looking to diversify their teams.

If you are focusing on the extraction modes, these Universal Tower Defense Z new units offer excellent utility and distinct status effects. The drop rates are relatively generous compared to traditional secret units, making them highly accessible for active players.

Human Spider (Spider-Man)

The Human Spider is a highly mobile crowd-control unit. It boasts a 25% drop rate from the extraction stages, making it a relatively straightforward farm for intermediate players.

Iron Billionaire (Iron Man)

Iron Billionaire provides massive area-of-effect (AoE) ranged damage. Similar to the Human Spider, this unit features a 25% drop rate within the extraction game mode.

Symbiotic Alien (Venom)

For players looking for high single-target damage and survivability, the Symbiotic Alien is the prize of the extraction pool. It has a slightly lower drop rate of 15%, requiring a bit more patience to obtain.

Trickster Phantom (Loki)

The Trickster Phantom is located in the secondary expedition game mode. What makes this unit unique is its built-in pity system. Players are guaranteed to receive the Trickster Phantom after completing exactly eight runs, eliminating the frustration of bad random number generation (RNG).

Crossover Unit	Drop Rate	Game Mode	Pity System
Human Spider	25%	Extractions	None
Iron Billionaire	25%	Extractions	None
Symbiotic Alien	15%	Extractions	None
Trickster Phantom	Random	Expeditions	Guaranteed at 8 Runs

Mythic and Unrivaled Summons

Mythic units form the backbone of most high-tier strategies. Update 4 introduces nine new mythic units, alongside an incredibly rare "Unrivaled" tier unit.

To help you navigate the summon banners, here is where the Universal Tower Defense Z new units in the Mythic and Unrivaled tiers stand:

The Banner Mythics

Six of the new mythic units are obtained directly through the standard summon banner. These include Bloody Captain, The Terror, Cat Captain, Zombie Apostle (also referred to as Corpse Maiden), and Fatality. Keeping an eye on banner rotations is key to securing these characters.

Castle of Greed Mythics

Not all mythics are locked behind the gacha system. Three of the new mythic units can be earned by playing the Castle of Greed, which is accessible via the Extractions portal. This allows free-to-play players to grind out top-tier units without relying solely on gems.

Visionary Unrivaled

The ultimate prize of the summon area is the Visionary. Classified as an "Unrivaled" unit (though technically occupying a unique sub-category of mythic), this unit features an incredibly low drop rate of 0.005%. Unlocking the Visionary is a major status symbol within the community due to the extreme luck required.

Unit Name	Rarity Tier	Source	Drop Rate / Requirement
Bloody Captain	Mythic	Summon Banner	Standard Mythic Rate
The Terror	Mythic	Summon Banner	Standard Mythic Rate
Cat Captain	Mythic	Summon Banner	Standard Mythic Rate
Zombie Apostle	Mythic	Summon Banner	Standard Mythic Rate
Fatality	Mythic	Summon Banner	Standard Mythic Rate
Castle of Greed Units (3)	Mythic	Castle of Greed	Gameplay Drop
Visionary	Unrivaled	Summon Banner	0.005% Drop Rate

Summer Event Exclusives and Cosmetic Skins

Alongside the standard roster additions, Update 4 introduces a seasonal Summer Event. This event features its own currency, unique game modes, and exclusive units that will likely become unavailable once the season ends.

Farming the summer event is essential if you want to add these limited-edition Universal Tower Defense Z new units to your roster.

Ashen Valkyrie and Azeron Wrath

These two exclusive units are obtained by opening Summer Capsules. To get these capsules, players must participate in the Summer Event game mode, which rewards summer currency upon completion. This currency can then be traded for capsules in the event shop.

The New Skin System

Update 4 also introduces a robust skin system featuring 17 new cosmetic variations for existing units. Players can access this feature through the updated Skin UI under the units menu. Skins can be acquired via:

Summer Skin Crates: Purchased using summer event capsules or Robux.
Contest Skin Crates: Purchased using standard in-game gems. Each crate costs 15,000 gems.

According to community reports, while the gem cost for crates is quite high (costing upwards of 1.5 million gems for a hundred pulls), it offers a viable path for free-to-play players to customize their favorite units, such as equipping the legendary Bunny Suit skin on Bulma.

Summer / Cosmetic Item	Type	Source	Cost / Currency
Ashen Valkyrie	Exclusive Unit	Summer Capsules	Summer Currency
Azeron Wrath	Exclusive Unit	Summer Capsules	Summer Currency
Contest Skin Crate	Cosmetic Crate	Skin Shop	15,000 Gems
Summer Skin Crate	Cosmetic Crate	Event Shop / Robux	Summer Capsules / Robux

Strategic Tips for Farming Update 4 Units

To efficiently farm all the Universal Tower Defense Z new units, players should prioritize their daily and weekly activities. Trying to unlock all 25 units at once can feel overwhelming, but focusing on one game mode at a time will yield better results.

Start with the Guaranteed Drops: Begin by clearing the Expedition mode eight times to secure the Trickster Phantom. This guarantees a strong new unit for your team with zero RNG variance.
Farm Extractions for Crossover Units: Run the Extraction stages to gather the Human Spider, Iron Billionaire, and Symbiotic Alien. With drop rates at 25% and 15%, you can easily collect all three in a few hours of dedicated play.
Save Gems for Banner Rotations: Do not spend all your gems on cosmetic crates early on. Keep a healthy reserve of gems to roll on the banner when mythics like Bloody Captain or Zombie Apostle are featured.
Join Co-op Teams for Raids: Stages like the Reaper City Raid (for Flame Captain Embers) and the Beast Desert Legends (for Drill Hero Spiral) are significantly easier when played with a coordinated group. Coordinate with players on Discord or community servers to speed up your runs.

Frequently Asked Questions (FAQ)

What is the rarest unit in Universal Tower Defense Z Update 4?

The rarest unit introduced in this update is the Visionary Unrivaled. It can be obtained from the summon area but features an extremely low drop rate of just 0.005%, making it one of the most difficult units to pull in the history of the game.

How do you get the Marvel-inspired Spider-Man and Iron Man units?

Known in-game as the Human Spider and Iron Billionaire, these crossover units are obtainable through the Extractions game mode. Both units have a 25% drop rate per successful run. You can also obtain the Symbiotic Alien (Venom) from the same mode at a 15% drop rate.

Are the Universal Tower Defense Z new units from the summer event permanent?

While the units themselves (Ashen Valkyrie and Azeron Wrath) will remain in your inventory permanently once unlocked, the ability to obtain them is limited to the duration of the Summer Event. Players must farm the summer currency and capsules before the event concludes to secure them.

How do I equip the new character skins in Update 4?

To equip your cosmetic skins, open the game menu, navigate to the "Units" tab, and select "Skins." From there, you can view your unlocked cosmetics, open purchased crates, and apply skins directly to your characters. Note that you must own the base unit to equip its corresponding skin.