Unlocking Universal Tower Defense's Secret Units
Discover how to obtain the three highly coveted secret units: Jinoo, Ragna, and Lelouch. Learn their acquisition methods and evolution requirements.


Jinoo, the protagonist from Solo Leveling, is arguably the most 'casual' secret unit to obtain in Universal Tower Defense. You can acquire him directly from the Special Banner in the Summoning area. However, there's a catch: you must be at least Level 10 in the game to even have a chance.
Once you meet the level requirement, head to the Summoning banner, check the index, and you'll find Jinoo listed with a minuscule 0.000625% chance of dropping. Good luck with your pulls!
Jinoo's Evolution

Evolving Jinoo is surprisingly one of the simplest processes among the secret units. To evolve him to 'Jinoo (Monarch)', you'll need two 'Demon King's Daggers' (Secret rarity) and one 'Shadow Token Mythic'. The best part is that these items are craftable, meaning you don't have to rely on rare drops from specific missions.

Ragna, the powerful dragon slayer, is obtained through a more direct, yet challenging, route. Navigate to the main 'Play' area and then proceed to the 'Special' portal located to your left. Once inside, you'll need to enter the 'Featured Challenge' section. Look for 'Act 1 Frozen Stronghold: The Hunt'. This is where Ragna can be found.
Ragna's Challenge and Drop Rate

The 'Frozen Stronghold' challenge itself is quite difficult, so it's highly recommended to tackle it with a team or ensure your units are powerful enough to solo. The boss has a substantial health pool, requiring strategic placement and strong DPS. Ragna has a 2% drop chance from this challenge, but if luck isn't on your side, there's a pity system that guarantees him after 75 successful runs.

Lelouch, a character inspired by Code Geass, presents the most intricate and time-consuming acquisition questline in Universal Tower Defense. This epic quest, titled 'Power Of Kings!', is found under the 'Personal' tab in your 'Quests' menu.
Part 1 - Level 30 & Mysterious Witch

The very first requirement for the 'Power Of Kings!' questline is to reach Level 30. Once you hit this milestone, claim the quest reward and seek out the 'Mysterious Witch' NPC in the lobby.
Part 2 - Distressed Subject & Chess Game

The Mysterious Witch will inform you about a 'distressed subject' needing help somewhere in the lobby. You need to identify the correct NPC, who will have a distinctive red, glowing Code Geass-like symbol above their head.
Part 3 - The Chess Challenge

Upon entering the designated stage, you must locate a hidden chessboard. Interacting with the chessboard initiates a chess game! You must play and win this chess game. The moves are randomized, meaning you can't rely on a fixed solution.
Part 4 & 5 - Endurance Trials & Final Steps

After conquering the chessboard, the quest continues with a series of endurance trials:
- Complete 80 waves in a single gamemode
- Kill 15 Boss enemies
- Upgrade any relic 75 times
- Place any unit 5,000 times in any game mode
Upon completing this final monstrous task, Lelouch (Big Bro) will be yours!
Conclusion
Acquiring Jinoo, Ragna, and Lelouch in Universal Tower Defense ranges from straightforward summoning to extensive questlines and challenging combat. While Jinoo offers a direct, albeit low-chance, summon and Ragna requires overcoming a tough event boss, Lelouch's quest demands significant time, exploration, and even a test of your chess skills! Each secret unit adds unique power to your arsenal, making the journey to obtain them well worth the effort.