Honkai: Star Rail CosmiCon Roll-On — All Event Details, Fastest Clears, and What to Prioritize

Cosmicon, Roll On! Guide – Best Picks & Fast Rewards | HSR 4.0

Honkai: Star Rail 4.0 introduces Cosmicon, Roll On!, a dice-driven duel event set in Planarcadia’s competitive card scene. It looks chaotic at first, but once you understand the core loop, it becomes surprisingly consistent—and very farmable.

This guide focuses on efficiency: learn the mechanics fast, follow the optimal card + dice path each round, and secure all limited-time rewards without wasting runs.

Event Duration & Requirements

Event Period:
After Version 4.0 update → March 23, 2026 (03:59 server time)
After the event ends, it moves to Conventional Memoir (gameplay remains, limited-time rewards do not).

Participation Requirements:

• Trailblaze Level ≥ 21

• Early access via Finality’s Vision (spoiler warning)

• Recommended: Complete Planarcadia — The Indifference of Those Who Yet Live

Permanent Access Later:

After the limited-time period, head to Dovebrook District and speak to Golden Youth to replay and claim permanent rewards.

How Cosmicon, Roll On! Works

Think of Cosmicon Collective as a tabletop duel powered by character cards and custom dice.

Each match follows this structure:

1. Choose a character card you own

2. Roll your dice to determine turn power

3. Compare totals with your opponent

4. Alternate attacking and defending

5. First to reduce enemy HP to 0 wins

As the duel progresses, Weather effects appear and influence both sides, forcing adaptation instead of pure dice gambling.

Winning matches grants:

• Experience Level progression

• Victorious Power Tokens

• Access to new cards and Prismatic Dice

• Card upgrades like Gilding

The more your collection grows, the more consistent your future runs become.

Core Mechanics Explained

1. Card-Tied Dice System

Dice are not random generics—they are tied to your selected character card.

Example dice combinations:

• 2 Purple d6

• 3 Blue d4

Higher-tier dice increase both max roll and reliability. Dice can level up through conditions (like selecting all even numbers).

Upgrade Path:
Blue d4 → Purple d6 → Orange d8 → Shining Dodecahedron

The better your dice, the smoother your damage spikes.

2. Prismatic Dice (Your Stability Tool)

Prismatic Dice reduce RNG swings.

Examples:

• Fixed-value dice (guaranteed high roll)

• Dice with special triggers

You obtain them using Victorious Power Tokens earned after matches.

Core loop:
Play → Earn → Upgrade → Play Cleaner

3. Pattern Combos

Cosmicon rewards pattern logic, not just high numbers.

Triggers include:

• Even/Odd sets

• Matching pairs

• All-same or all-different rolls

• Multiple pairs (can trigger bonus attack cycles)

Landing correct combinations can grant extra attacks in the same turn.

Modes & Progression

Story Battles

You begin with structured progression fights against NPC opponents.

Clearing these:

• Unlocks new tools

• Grants EXP and tokens

• Advances event milestones

Street Duels

After progressing far enough, you can duel NPCs around Planarcadia for extra matches and faster farming.

Free Co-op (Unlocked Later)

• Duel random players (ranked climb)

• Duel friends (no rank points, practice only)

Friend matches are casual. Random matches are competitive.

Event Rewards (Full Clear)

If fully completed, rewards include:

• Stellar Jade ×1500

• Self-Modeling Resin ×1

• Tracks of Destiny ×2

• Fateful Crossings: “Cosmicon, Roll On!” ×1

  • Choose 1 of 22 different 4★ characters

• Trailblaze Headwear: “Ah! Youth!”

• Traveler’s Guide

• Refined Aether

• Lost Crystal

• Credits

• The Fluffy Serialization Memorial Issue

The 4★ selector is tied to limited-time missions—clear everything before the event ends.

Best Win Route (Round-by-Round Plan)

The key idea:
Pick the correct Character Card and Prismatic Dice early, and the rest becomes manageable RNG.

Round 1

Character Card: Firefly
Prismatic Dice: Sorcerer

Firefly offers solid early consistency and good scaling potential.

Round 1 Tips

On Offense:

• If you roll double 6 → always take double 6

• If not → select highest value combination

On Defense:

• Preserve HP early; don’t overspend rerolls

Round 2

Character Card: Hyacine
Prismatic Dice: Oath

Hyacine provides better scaling and stability for mid-run fights.

IMPORTANT: Shop Swap

After clearing Round 2:

• Go to the shop

• Exchange for True • Oath

• Equip it on Hyacine immediately

From this point onward, Hyacine becomes your carry.

Round 3 – Final Round

Character Card: Hyacine
Prismatic Dice: True • Oath

You can keep running Hyacine with True • Oath through the final stages.

Advanced Tips for Clean Runs

Offensive Priority

• Double 6 > Matching pairs > Highest total

• Don’t chase cute patterns if raw numbers win

Defensive Priority

• If HP drops low → activate True • Oath

• Stabilize first, then spike damage

Resource Management

• Upgrade core dice before expanding collection

• Don’t over-diversify early

• Prioritize consistency over flashy combos

Final Thoughts

Cosmicon, Roll On! looks RNG-heavy—but it’s actually a pattern-and-progression mode disguised as gambling.

Follow this route:

Firefly + Sorcerer 
Hyacine + Oath 
Upgrade to True • Oath 
Carry with Hyacine

This setup gives you strong odds to clear efficiently, secure the 1500 Stellar Jade, and lock in your 4★ selector without frustration.

If you’re playing for rewards, play smart not random. 

Want to make the most of CosmiCon Roll-On or need a jump start for future events? GameMarket.gg is your launchpad: find Accounts loaded for banner luck, book Hourly Services for event coaching and farming, or tap Boosting to clear every milestone and claim all rewards stress-free.

GameMarket.gg is a trusted digital marketplace for everything gaming-related. We serve the gaming community by providing secure access that enhances every gaming journey.