So, you’ve got the mad scientist herself. Honestly, Agnes Tachyon is one of the most rewarding girls to train in Uma Musume Pretty Derby, but if you treat her like a standard miler, you’re going to hit a wall. Hard. Most people look at her 20% Speed growth and think, "Easy, I’ll just stack Speed cards and call it a day."
That is exactly how you end up with a Tachyon who gasses out at the Arima Kinen or gets boxed in during the final corner of a Medium-distance PvP race.
Why the Agnes Tachyon Build is Secretly Tricky
Tachyon is a bit of an anomaly. She’s technically a 1-star unit (at least initially), which leads some players to underestimate her potential. Big mistake. Her kit is actually optimized for Medium and Long distances, even though her base Long aptitude starts at a B. You’ve probably noticed she has a 10% growth bonus in Guts, which is... well, it's a thing. While some meta-chasers call Guts a "dump stat," in 2026, we know better. You can't just ignore it if you want her to survive the final stretch of a 2500m race.
The real backbone of any successful Agnes Tachyon build is her Unique Skill: U=ma2 (or Introduction to Physiology if you haven't awakened her yet). It's a stamina recovery skill that triggers on a corner in the second half of the race. This is your "get out of jail free" card for stamina, allowing you to focus more on raw Speed and Power than you would with, say, Mejiro McQueen.
The Stat Priority You Actually Need
Forget the "Speed is King" mantra for a second. While Speed is obviously vital, your priority list for Tachyon should look more like this:
- Speed: Aim for the cap, obviously. Her 20% bonus makes this easy.
- Stamina: Just enough to survive. Since her Unique Skill heals about 5.5% stamina, you can "cheat" the requirements by about 100-150 points.
- Power: Essential for a Pace Chaser. If she doesn't have the Power to push through the pack when she activates her acceleration skills, she’s just a very fast girl stuck behind a wall of meat.
- Wit: Don't sleep on this. You need at least 400-600 Wit to ensure her skills actually trigger. A Tachyon who doesn't use her heal is a Tachyon who loses.
Support Card Decks That Actually Work
If you're still running a random mix of cards, we need to talk. Your deck composition determines about 70% of your success.
For a solid Medium-distance build, most high-level players are running a 3 Speed / 2 Wit / 1 Stamina split. Or, if you have cracked inheritance, you can go 4 Speed / 2 Wit and rely on your ancestors for the Stamina.
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The Must-Haves
Kitasan Black (SSR): Look, I know everyone says this. But she is the gold standard for Speed for a reason. The specialty priority is unmatched. If you don't own her at Limit Break 3 or higher, just borrow a friend's maxed-out copy.
Super Creek (SSR): If you are struggling with the Long distance races in her career (like the Arima Kinen), Super Creek is your best friend. She gives "Swinging Maestro," which is basically a massive Stamina safety net.
Fine Motion (SSR): The queen of Wit cards. Since Tachyon has a 10% Wit growth, stacking Fine Motion's training bonus on top of that results in massive stat gains without burning energy.
The Early Game Trap: Front Running?
Here is a pro tip most guides won't tell you: Run Tachyon as a Front Runner for her first three races.
Wait, what?
Yes. Even though she’s an "A" in Pace Chasing and an "E" in Front Running, the stats in the Debut and early Pre-OP races are so low that everyone is equally bad. In these early sprints, Pace Chasers and Late Surgers get boxed in by generic NPCs constantly. By switching her strategy to Front Running for the first few races, you ensure she stays at the head of the pack where no one can block her. Once you hit the Japanese Derby (Tokyo Yushun), switch her back to Pace Chasing.
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Skills to Hunt For
You want skills that trigger in the mid-to-late race. Since Tachyon thrives on corners, Corner Adept and Professor of Curvature are non-negotiable.
- Straightaway Adept: Good for that final burst.
- Speed Star: Incredible for the final corner.
- Race Planner: This is her gold recovery skill. If you can get this alongside her Unique, she becomes virtually impossible to tire out.
Actually, let's talk about Dominator. This is her signature debuff skill. It decreases the velocity of runners ahead of her in the late race. In PvP, this is devastating. It's not just about how fast she goes; it's about making everyone else slower.
Navigating the Training Events
Tachyon has some weird events. In "The Strongest Collaborator," you'll often be tempted to take the top option for the Stamina and Guts. Honestly? Most of the time, the bottom option is better because it gives +Energy and +Wit. Keeping her energy high so you don't have to waste a turn "Resting" is the secret to hitting S-rank stats.
Every turn you spend resting is a turn you aren't gaining Speed. If your Wit is high enough, you can use Wit training to recover a small amount of energy while still gaining stats. It's the "infinite loop" strategy that the top-tier Japanese players have been using for years.
How to Handle the Arima Kinen
The Arima Kinen is the "boss fight" of Tachyon's career. It's 2500m, and her B-rank in Long distance makes it a gamble.
To win this consistently, you need two things:
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- At least 450 Stamina.
- One gold recovery skill (like Maestro or Race Planner) OR two blue recovery skills.
If you go in with 300 Stamina and no skills, she will lead the race until the final 200 meters and then literally stop. It's painful to watch. Use your inheritance to try and bump that Long aptitude from B to A before you even start the run.
Final Thoughts for the Lab
Building the perfect Agnes Tachyon is about balance. You're playing a character who is a glass cannon by nature, but her skills allow her to act like a tank. Focus on those Speed and Wit rainbows. Don't be afraid to fail a few runs to get the right skill hints.
The most important thing is to stop over-training Speed in the first year. Use the Junior season to build up your Friendship gauges with your support cards. If you don't have those "rainbow" training sessions ready by the time the Classic year hits, you're going to fall behind the stat curve.
Once you have your support cards at high bond levels, the 20% Speed growth will do the heavy lifting for you in the second half of the training. Focus on the foundation early, and the "science" will take care of the rest.
To get the most out of your next run, double-check your inheritance to see if you can snag a Long Distance 1 or 2 factor to fix her aptitude. It makes the career mode significantly less stressful. After that, prioritize getting a max-limit-break Kitasan Black friend to follow; that 100% specialty rate change is the difference between a B+ and an S rank.