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When diving into the competitive world of Umamusume: Pretty Derby, few characters offer the sheer satisfaction of a well-executed late-game comeback quite like the foreign-born prodigy, and mastering the ultimate Umamusume: Grass Wonder Build is your ticket to dominating the track. While she may appear soft-spoken and composed, Grass Wonder possesses a hidden ferocity that shines best when she is tearing through the pack in the final furlong, a trait that makes her one of the most exciting characters to train for both the URA Finals and high-stakes PvP Team Stadiums. To truly unlock her potential, trainers must navigate a complex web of stat management, carefully selecting support cards that compliment her natural 20% growth rate in Speed and 10% in Power, while ensuring she has just enough Stamina to survive the grueling Long distance races she is famously fond of. This guide will walk you through every step of her development, from navigating her tricky objective races like the Arima Kinen to selecting the precise skill inheritance loops that turn her “Stone-Piercing Blue” unique ability into a reliable weapon of mass destruction. By understanding the nuances of her “Betweener” and “Chaser” run styles, you can stop relying on luck and start engineering victories with a precision that would make any veteran trainer proud.
Core Stats And Growth Rates
Understanding Grass Wonder’s natural aptitude is the foundation of any successful run. Unlike pure sprinters who dump everything into velocity, Grass Wonder is a tactical racer who benefits heavily from her +20% Speed and +10% Power growth modifiers. This specific distribution screams for a build that prioritizes explosive acceleration.​
- Speed (Priority 1): You should aim to cap this or get as close to 1200 as possible. Speed is what governs her maximum velocity during that crucial final spurt.
- Power (Priority 2): Since Grass Wonder spends most of the race surrounded by other girls in the “Betweener” or “Chaser” position, she needs high Power (aim for 900+) to muscle her way out of “blocks” and accelerate when the path clears.​
- Stamina (Variable): This is the tricky part. While she runs Mile races, she also has mandatory Long distance objectives. You generally need around 600-800 Stamina (often supplemented by a gold recovery skill like Arc Maestro) to ensure she doesn’t fade in the Arima Kinen.​
Racing Aptitude And Strategy
Grass Wonder is unique because her default aptitudes pull her in two different directions, and your build must commit to one for maximum efficiency.
The Betweener Strategy (Sashi)
This is her default A-rank strategy and arguably the easiest to build for beginners. As a Betweener, she stays in the middle of the pack (around 6th-9th place) and surges late. This style relies heavily on Power to navigate traffic. The advantage here is that many of her awakening skills are tuned for this positioning, allowing for a smoother transition from mid-game to end-game.​
The Chaser Strategy (Oikomi)
Although she starts with a B in Chaser, many advanced trainers prefer modifying her into a Chaser via inheritance. By sitting at the very back of the pack, she avoids the chaotic mid-pack clusters that often block Betweeners. This strategy maximizes the potential of her unique skill, which triggers when passing enemies, but it requires finding parent horses with Chaser genes to bump that B up to an A.​
Distance Management
Grass Wonder has an odd mix of Mile (A) and Long (A), but only a B in Medium. One of the first things you should do in the inheritance menu is secure at least one star in Medium Distance to raise this to an A. If you leave it at B, she will struggle in critical races like the Japanese Derby, potentially ending your run prematurely.​
Recommended Support Cards
Your deck composition will make or break the Umamusume: Grass Wonder Build. Because of her growth rates, a “Speed and Power” deck or a “Speed and Intelligence” deck works best, depending on your available cards.
- Speed Cards: Kitasan Black remains the gold standard for providing massive speed gains and the indispensable “Arc Maestro” skill if you are using the SSR version (though usually, you get Maestro from Super Creek). Other top picks include Eishin Flash (SR or SSR) which synergizes perfectly with her Betweener playstyle.​
- Stamina Cards: Super Creek is practically mandatory for Long distance builds. Her “Arc Maestro” skill provides enough stamina recovery to let you focus your training on Speed and Power without worrying about her running out of gas.​
- Intelligence/Wit Cards: Fine Motion or Nice Nature can be excellent for raising her Intelligence, which lowers the mana cost of skills and helps her navigate the pack intelligently without getting boxed in.​
Essential Skills For Victory
Grass Wonder’s unique skill, “Spirit of the Ascending Dragon” (also translated as Focused Mind or similar variants), activates when she overtakes someone while rising through the ranks in the final straight. To ensure this triggers, you need skills that position her correctly.​
- Acceleration Skills: “Non-Stop Girl” or “Lightning Step” are crucial for helping her burst out of the pack.
- Recovery Skills: As mentioned, “Arc Maestro” is vital for her Long races. If you are running a purely Mile-focused build for PvP, you can skip this, but for the main scenario, you need it.​
- Positioning Skills: “Betweener Tricks” or “Positioning Sense” help her find good lanes so she doesn’t get stuck behind a wall of slower runners, which is the number one cause of losses for Grass Wonder.​
Inheritance And Factor Selection
When selecting parents for Grass Wonder, do not just look for stats; look for Red Factors that fix her holes.
- Medium Distance Factor: As noted, fixing her B rank in Medium is priority number one.​
- Power/Stamina Factors: Since her training will focus heavily on Speed drills (which also boost Power), using inheritance to pad out her Stamina is a smart play. This saves you from having to waste turns doing Stamina training when you could be boosting her Speed or Intelligence.​
By focusing on these elements, you will transform Grass Wonder from a simple Yamato Nadeshiko into a turf-dominating monster who pierces through the competition with the elegance of a drawn blade.
