Astro Arena – Drop Rate Disclosure

Last Updated: 17 September 2026

This article discloses the drop rates for Wonder Stones, the Maestra Sephir Lucky Spin, the Black Bunny Fei Lucky Spin, and the Roulette events in Astro Arena.

Part 1. Wonder Stone

A Wonder Stone first determines a reward grade based on the probabilities below, and then a specific reward within that grade is drawn according to the grade’s reward table.

1. Reward Grade Probability by Wonder Stone Type

When you open a Wonder Stone, the reward grade is decided first using the rates below.

Wonder Stone Type

Common

Rare

Epic

Ultimate

Total

Wonder Stone

45%

37%

15%

3%

100%

RARE Wonder Stone

—

57%

36%

7%

100%

EPIC Wonder Stone

—

—

80%

20%

100%

ULTIMATE Wonder Stone

—

—

—

100%

100%

2. Reward Probability within Each Grade

Once a grade is decided, the specific reward is drawn at the rates below. Probabilities are conditional within each grade (each grade totals 100%). For collectible rewards (Emotes, Characters, Skill Enhancements), if you already own the item, you receive the substitute reward shown in the last column instead.

Common

Reward

Quantity

Probability (%)

If Duplicate (Substitute Reward)

Coin

50

70%

N/A

Character Card

30

30%

N/A

Total

 

100%

 

Rare

Reward

Quantity

Probability (%)

If Duplicate (Substitute Reward)

Coin

100

56.5%

N/A

Character Card

70

30.4%

N/A

Master Growth Card

30

13%

N/A

Total

 

100%

 

Epic

Reward

Quantity

Probability (%)

If Duplicate (Substitute Reward)

Character Token

10

5.8%

N/A

Emote — category total 15.4%

Heart Emote

1

0.96%

Coin ×50

Question Mark Emote

1

0.96%

Coin ×50

Exclamation Mark Emote

1

0.96%

Coin ×50

Flag Emote

1

0.96%

Coin ×50

Let's Fight Emote

1

0.96%

Coin ×50

GG Emote

1

0.96%

Coin ×50

Shubi Weeping Emote

1

0.96%

Coin ×50

Zeno Jeering Emote

1

0.96%

Coin ×50

Cherry Affectionate Emote

1

0.96%

Coin ×50

Fran Smirk Emote

1

0.96%

Coin ×50

Outh Scoff Emote

1

0.96%

Coin ×50

Shubi Sorry Emote

1

0.96%

Coin ×50

Surrender Emote

1

0.96%

Coin ×50

Olga Thinking Emote

1

0.96%

Coin ×50

Cherry Wink Emote

1

0.96%

Coin ×50

Zeno Yawn Emote

1

0.96%

Coin ×50

Coin

400

40.4%

N/A

Character Card

300

28.8%

N/A

Master Growth Card

200

9.6%

N/A

Total

 

100%

 

Ultimate

Reward

Quantity

Probability (%)

If Duplicate (Substitute Reward)

Rare Character — category total 4%

Olga

1

0.57%

Character Token ×20

Fran

1

0.57%

Character Token ×20

Fei

1

0.57%

Character Token ×20

Cherry

1

0.57%

Character Token ×20

Xeble

1

0.57%

Character Token ×20

Khalid

1

0.57%

Character Token ×20

Outh

1

0.57%

Character Token ×20

Character Token

20

4%

N/A

Active Skill Enhancement — category total 5%

Final Protocol: Repair

1

0.18%

Coin ×3,000

Final Protocol: Automation

1

0.18%

Coin ×3,000

Satellite Beam: Lightning

1

0.18%

Coin ×3,000

Satellite Beam: Trident

1

0.18%

Coin ×3,000

Mecha Stomp: Vortex

1

0.18%

Coin ×3,000

Mecha Stomp: Reload

1

0.18%

Coin ×3,000

Bullet Waltz: Quick Aim

1

0.18%

Coin ×3,000

Bullet Waltz: Tempest

1

0.18%

Coin ×3,000

Rapid Burst: Slowdown

1

0.18%

Coin ×3,000

Rapid Burst: Focus

1

0.18%

Coin ×3,000

Abyssal Slash: Focus

1

0.18%

Coin ×3,000

Abyssal Slash: Fatal

1

0.18%

Coin ×3,000

Bind Arrow: Charge

1

0.18%

Coin ×3,000

Bind Arrow: Snipe

1

0.18%

Coin ×3,000

Lightning Storm

1

0.18%

Coin ×3,000

Shockwave

1

0.18%

Coin ×3,000

Tika's Support: Vitality

1

0.18%

Coin ×3,000

Tika's Support: Companion

1

0.18%

Coin ×3,000

Carpet Bomb: Dropdown

1

0.18%

Coin ×3,000

Carpet Bomb: Rapid

1

0.18%

Coin ×3,000

Assault Slash: Stun

1

0.18%

Coin ×3,000

Assault Slash: Mode Change

1

0.18%

Coin ×3,000

Sonic Stinger: Snare

1

0.18%

Coin ×3,000

Sonic Stinger: Fatal

1

0.18%

Coin ×3,000

Magnetic Rush

1

0.18%

Coin ×3,000

Shock Rush

1

0.18%

Coin ×3,000

Heat-Seeking Beam: Overcharge

1

0.18%

Coin ×3,000

Heat-Seeking Beam: Sortie Order

1

0.18%

Coin ×3,000

Special Skill Enhancement — category total 5%

Shock Onslaught

1

0.18%

Coin ×5,000

Life Steal Onslaught

1

0.18%

Coin ×5,000

Slow Buster

1

0.18%

Coin ×5,000

Final Buster

1

0.18%

Coin ×5,000

Defensive Missile

1

0.18%

Coin ×5,000

Mega Missile

1

0.18%

Coin ×5,000

Safety Roll

1

0.18%

Coin ×5,000

Acceleration Roll

1

0.18%

Coin ×5,000

Dual Pulse Charge

1

0.18%

Coin ×5,000

Time Slip Charge

1

0.18%

Coin ×5,000

Long Snatcher

1

0.18%

Coin ×5,000

Wall Snatcher

1

0.18%

Coin ×5,000

Hammering Shot

1

0.18%

Coin ×5,000

Power Shot

1

0.18%

Coin ×5,000

Returning Grab

1

0.18%

Coin ×5,000

Explosive Grab

1

0.18%

Coin ×5,000

Sharp Wave

1

0.18%

Coin ×5,000

Recovery Wave

1

0.18%

Coin ×5,000

Arcane Punch: Focus

1

0.18%

Coin ×5,000

Arcane Punch: Flame

1

0.18%

Coin ×5,000

Typhoon Blade

1

0.18%

Coin ×5,000

Rapid Blade

1

0.18%

Coin ×5,000

Force Barrier: Splash

1

0.18%

Coin ×5,000

Force Barrier: Reflection

1

0.18%

Coin ×5,000

Regeneration Ring

1

0.18%

Coin ×5,000

Immunity Ring

1

0.18%

Coin ×5,000

Leaping Arrow Rain

1

0.18%

Coin ×5,000

Suppressive Arrow Rain

1

0.18%

Coin ×5,000

Master Growth Card

500

9%

N/A

Coin

1,000

46%

N/A

Character Card

800

27%

N/A

Total

 

100%

 

* Per-item probabilities for Emotes, Characters, and Skill Enhancements are the category probability divided equally among the items in that category, rounded to two decimals. Because of rounding, a grade’s displayed total may differ slightly from 100%.

* “If Duplicate” shows the reward you receive when the drawn item is already owned. “N/A” means duplicate handling does not apply (e.g. currency).

Part 2. Maestra Sephir Lucky Spin

Each spin draws one reward from the table below. If you already own a collectible reward, you receive Mileage instead, which can be exchanged for items at the Mileage Exchange.

1. Lucky Spin Reward Probability

Each spin draws one reward at the rates below (total 100%). Rewards are grouped by category for readability; the probability shown for each item is its own draw rate.

Reward

Quantity

Probability (%)

If Duplicate (Substitute Reward)

Skin Module — category total 0.60%

Maestra Sephir [Appearance Module]

1

0.20%

Mileage ×100

Maestra Sephir [Motion Module]

1

0.20%

Mileage ×100

Maestra Sephir [Kill Module]

1

0.20%

Mileage ×100

Collection Items — category total 8.00%

Maestra Sephir Finger Heart Emote

1

2.00%

Mileage ×5

Maestra Sephir Kiss Emote

1

2.00%

Mileage ×5

Maestra Sephir Laugh Emote

1

2.00%

Mileage ×5

Maestra Sephir Profile Icon

1

2.00%

Mileage ×5

Additional Skin — category total 1.00%

Academy Medic Sephir

1

1.00%

Mileage ×20

Currency and Skill — category total 90.40%

Heat-Seeking Beam: Overcharge

1

1.50%

N/A

Heat-Seeking Beam: Sortie Order

1

1.50%

N/A

Leaping Arrow Rain

1

0.70%

N/A

Suppressive Arrow Rain

1

0.70%

N/A

Character Token

3

21.50%

N/A

Master Growth Card

50

21.50%

N/A

Character Card

30

21.50%

N/A

Coin

150

21.50%

N/A

Total

 

100%

 

* “If Duplicate” shows the Mileage you receive instead when the drawn item is already owned. “N/A” means duplicate handling does not apply — the item can be obtained more than once.

* Every spin also grants Mileage in addition to the drawn reward.

2. Collection Rewards

Collecting the items below during the Lucky Spin period grants the following rewards.

Reward Type

Reward

Quantity

Required Items

Intermediate Collection Reward

Maestra Sephir Profile Frame

1

Maestra Sephir Finger Heart Emote ×1 / Maestra Sephir Kiss Emote ×1 / Maestra Sephir Laugh Emote ×1 / Maestra Sephir Profile Icon ×1

Final Collection Reward

Maestra Sephir [Effect Module]

1

All four items above, plus Maestra Sephir [Appearance Module] ×1 / Maestra Sephir [Motion Module] ×1 / Maestra Sephir [Kill Module] ×1

* If a collection reward is still unclaimed when the Lucky Spin period ends, it is sent to your mailbox.

3. Season Notice

Lucky Spin contents and drop rates change from season to season. The rates currently in effect are always shown in the probability popup on the Lucky Spin screen. If the information in this article differs from the in-game probability popup, the in-game popup takes precedence.

Part 3. Black Bunny Fei Lucky Spin

Each spin draws one reward from the table below. If you already own a collectible reward, you receive Mileage instead, which can be exchanged for items at the Mileage Exchange.

1. Lucky Spin Reward Probability

Each spin draws one reward at the rates below (total 100%).

Reward

Quantity

Probability (%)

If Duplicate (Substitute Reward)

Skin — category total 0.40%

Black Bunny Fei

1

0.40%

Mileage ×100

Collection Items — category total 9.10%

Black Bunny Fei Sassy Emote

1

2.00%

Mileage ×5

Black Bunny Fei Shy Emote

1

2.00%

Mileage ×5

Black Bunny Fei Wink Emote

1

2.00%

Mileage ×5

Black Bunny Fei Icon

1

1.55%

Mileage ×5

Black Bunny Fei Frame

1

1.55%

Mileage ×5

Currency and Skill — category total 90.50%

Bullet Waltz: Quick Aim

1

0.85%

N/A

Bullet Waltz: Tempest

1

0.85%

N/A

Safety Roll

1

0.40%

N/A

Acceleration Roll

1

0.40%

N/A

Character Token

3

22.00%

N/A

Master Growth Card

20

22.00%

N/A

Character Card

30

22.00%

N/A

Coin

100

22.00%

N/A

Total

 

100%

 

* “If Duplicate” shows the Mileage you receive instead when the drawn item is already owned. “N/A” means duplicate handling does not apply.

* Every spin also grants Mileage (×3) in addition to the drawn reward.

2. Season Notice

Lucky Spin contents and drop rates change from season to season. The rates currently in effect are always shown in the probability popup on the Lucky Spin screen. If the information in this article differs from the in-game probability popup, the in-game popup takes precedence.

Part 4. Roulette Events

Each spin draws one reward from the table below.

1. Ad Roulette

Reward

Quantity

Probability (%)

Maestra Sephir Lucky Spin Ticket

1

0.5%

Master Growth Card

10

20.0%

Frontier Core

100

17.0%

Coin

30

20.0%

Astro Gem

5

1.8%

Character Token

2

10.0%

Black Bunny Fei Lucky Spin Ticket

1

0.7%

Master Growth Card

30

7.0%

Frontier Core

200

9.0%

Coin

50

10.0%

Astro Gem

10

1.0%

Supplementary Attendance Ticket

1

3.0%

Total

 

100%

2. Gem Roulette

Reward

Quantity

Probability (%)

Black Bunny Fei Lucky Spin Ticket

30

0.01%

Master Growth Card

20

18.06%

Ultimate Pass Premium Ticket

1

0.20%

Coin

20

18.06%

Maestra Sephir Lucky Spin Ticket

1

7.50%

Character Token

2

18.06%

Prism Skins Jewel

10

0.59%

Master Growth Card

40

13.50%

Black Bunny Fei Lucky Spin Ticket

1

10.00%

Coin

40

13.50%

Epic Pass Premium Ticket

1

0.40%

Prism Skins Jewel

5

0.12%

Total

 

100%

Gem Roulette – Cumulative Rewards

Reaching the cumulative spin counts below grants the following rewards.

Stage

Cumulative Spins

Reward

Quantity

1

10

Black Bunny Fei Lucky Spin Ticket

1

2

20

Maestra Sephir Lucky Spin Ticket

1

3

40

Black Bunny Fei Lucky Spin Ticket

3

4

60

Maestra Sephir Lucky Spin Ticket

3

5

80

Black Bunny Fei Lucky Spin Ticket

6

6

100

Maestra Sephir Lucky Spin Ticket

6

Notice

Drop rates are subject to change through game updates. Any changes will be announced accordingly.