Universal Tower Defense hides some of its strongest and rarest characters behind secret mechanics rather than the regular gacha banner. Three names stand out: Lulu (Lelouch), Ragnaw and SJW. Each one arrives through a different system, from a long, multi-step quest chain to a brutally low banner rate.
How to unlock Lulu (Lelouch) through the Power of Kings quest
Lulu is the most complex secret unit to obtain. You don’t summon him; you earn him through a personal questline called Power of Kings. The entire chain is level-gated and designed as late-game content.
Power of Kings: finding the “distressed subject”
The second part of the chain asks you to talk to a “distressed subject” somewhere in the lobby. This is a fixed NPC chosen from a small pool of anime characters placed around the hub.
Possible distressed NPCs include:
- Bleach characters such as Gen (Gin Ichimaru) or Rukia
- One Piece characters such as Luffy or Shanks
- Naruto characters, such as Naruto himself
Only one of these will be marked for you. To identify the correct one, run through the lobby and look for an NPC with a red arrow / triangular icon floating above their head. That icon is visible from range, so you can scan large areas quickly.
Power of Kings: going to the familiar map and solving the chessboard
The quest then tells you that the subject is “talking nonsense” and suggests visiting a place they are familiar with, where you will “find a certain board game.” This is a reference to a small chess puzzle hidden in one of the story maps, themed after the anime your NPC comes from.
The mapping works like this:
| Distressed NPC | Anime | Map to play |
|---|---|---|
| Naruto | Naruto | Ninja Forest |
| Luffy (or other One Piece NPC) | One Piece | Marine Base |
| Gen / Rukia (Bleach NPCs) | Bleach | Hollowed Moon |
Any Act on the correct map works; the chessboards can appear in all of them.
Once the puzzle is open, you must checkmate the opposing king. The layout is simplified compared with regular chess, and the solution is deliberately short. The game offers a list of possible moves such as “King to 73” or “Rook to 81,” and you pick from those in sequence.
On some runs, the board position stays identical each time, so you can repeat a solved sequence. On others, the exact solution may differ. In either case you have unlimited attempts because you can restart the story stage and re-trigger the same board.
Power of Kings: meeting the mysterious woman
After the chess puzzle, the quest asks you to find a “mysterious woman.” This is the same Mysterious Witch NPC used to start the chain, recognizable as C.C. from Code Geass sitting on the wall near the Play and Extras portals.
Power of Kings: the four grind challenges
The tail end of Lulu’s unlock path is a sequence of four numeric challenges. These can be completed in any order they appear, but each must be turned in before the next one activates.
Complete 80 waves in a single game mode
This requirement tracks a single run that reaches at least wave 80.
Kill 15 boss enemies
Boss kills can come from Infinite or Story, and they do not need to be in a single match. The fastest approach is to target a short stage with an early boss wave.
Upgrade any relic 75 times
This step sounds more expensive than it is, because the quest counts individual upgrade presses, not relic levels. If you click “Max” and jump several levels at once, it still only counts as a single upgrade.
Place any unit 5,000 times
The final requirement is the most time-consuming: placing any unit 5,000 times in any mode. Selling the unit does not reduce the count; the game simply tracks placements.
Once claimed, Lulu appears in your unit inventory like any other mythic. The Power of Kings quest is not repeatable, so there is no way to earn dupes of Lulu through the same chain; you are limited to the single copy awarded.
How Lulu plays once unlocked
Lulu is designed as a high-skill support unit modeled after Lelouch’s Geass powers. Instead of dealing regular DPS with attacks every few seconds, he issues “orders” that manipulate enemy behavior and convert their health into damage against each other.
Key traits of Lulu’s kit:
- Orders instead of attacks. Lulu’s stat card shows damage and SPA, but his core function is to apply status-like commands. His cooldown governs how often he can apply a new order once the previous one ends.
- Stand still. This order stuns a target for a few seconds and makes it collide with the enemies behind it. Both the stunned enemy and the stacked enemies exchange damage, which is effectively turning boss or mini-boss HP into an area nuke.
- Retreat. This order forces enemies to walk backward while they are in Lulu’s line of sight, buying time for your other units and amplifying slows.
- Attack. This order briefly sends enemies backward in a way that can also cause collisions, similar in spirit to Stand still but with shorter duration.
On higher upgrades, Lulu unlocks:
- Absolute Control (around upgrade 7), which spreads his current order across every enemy on the map at once, effectively globalizing a stun or retreat effect.
- Beam (around upgrade 10), which converts his listed damage stat into a one-time frontal hit equal to 100% of that value.
In the current balance, several of these abilities are buggy or underwhelming, which makes Lulu feel weaker than his unlock difficulty suggests. However, his design clearly targets very high-HP late-game bosses, where converting part of a boss’s health into splash damage against its own escorts can remove millions of effective HP in one interaction. For now he sits more in a niche support role, but he has obvious room for future tuning.
How to get Ragnaw from Featured Challenges
Ragnaw is a secret unit tied to the game’s challenge system rather than the main banner or a long questline.
Ragnaw’s evolution uses the same general item system as other mythics. There is no extra hidden requirement or unique material dungeon; his evo materials come from the usual drops and crafting routes.
How to get SJW from the banner
SJW is the purest “secret banner” unit in Universal Tower Defense. There is no quest, map, or challenge for him; he simply shares the standard gacha but with an extreme rarity.
Key details:
- SJW appears as a Banner Secret unit in the Index.
- His base drop rate is roughly 0.00625%, which is far lower than regular mythics.
- There is no pity listed for SJW, so in practical terms he is a long-term chase that may require enormous gem investment.
The only way to maximize your chances is to save large amounts of gems, focus your spending when SJW is visibly on the banner, and use any available luck-boosting items the game offers. There are no side systems that increase his rate beyond that.
Other secret and exclusive units in Universal Tower Defense
Beyond Lulu, Ragnaw, and SJW, several other units are tagged as secret or exclusive because they come from special systems rather than the standard banner.
| Unit | Type | How to obtain |
|---|---|---|
| SJW | Banner Secret | Summoning banner only, ~0.00625% rate, no pity |
| Ragnaw | Challenges Secret | Featured Challenge reward, 2% per win, pity at 75 runs |
| Lelouch (Lulu) | Quest Secret | Power of Kings questline starting at level 30 |
| Obito (Shiny) | Exclusive | AFK Chamber reward |
| Obito (Regular) | Exclusive | Daily login rewards |
| Law (normal & shiny) | Battle Pass | Battle Pass level 50 |
| Isagi (normal & shiny) | Battle Pass | Battle Pass level 25 |
| Sakuya | Shop Exclusive | Purchased from the Virtual Shop for 500 tokens |
All of these units are designed as long-term goals rather than early-game staples. Some, like Lulu, pay you back in trait rerolls and resources even if you decide not to field them heavily, while others, like SJW and Ragnaw, are primarily about raw combat power with a lot of grind attached.
If you care about completing collections, start with Lulu’s quest while passively working on Featured Challenges for Ragnaw and saving gems for SJW. The earlier you begin chipping away at these requirements, the less punishing they feel later.
