To reliably acquire Primal Grimoires and Star Soul materials during an Idle Heroes scratchcard event, budget your resources to reach guaranteed milestone reward tiers instead of gambling for random jackpot tiles. Lucky tile matches can occasionally produce high-multiplier payouts such as 11x Grimoires, but milestone reward tracks provide the guaranteed selection chests needed for steady progression.
Milestone Thresholds vs. Tile Jackpots
Scratchcard events combine random tile reveals with cumulative milestone meters. Relying on tile luck alone leads to unpredictable results and wasted resources.
- Milestone Meters: Every card completed adds points toward guaranteed reward tiers. Selection chests containing Primal Grimoires and Star Soul materials sit at these fixed thresholds.
- Card Tiles: Concealed spaces contain base materials (such as Spiritual Essence and Stellar Shards), premium items (such as Core of Origin shards and Grimoire pages), and multiplier icons.
- Jackpot Multipliers: Multiplier tiles amplify matched rewards on the active card. While an 11x Grimoire payout accelerates account growth, treat it strictly as a bonus rather than your primary acquisition plan.
Budgeting Event Currency
Before spending Contract Starry Gems (CSG) or event tickets, calculate whether your current stockpile can fully clear your target milestone tier.
- Calculate the Threshold Cost: Determine the exact number of cards and currency required to reach the milestone chest you want.
- Assess Your Stash: If your resources fall short of the next major Grimoire or Star Soul tier, hold your CSG for a future event. Stopping midway leaves you with low-tier baseline consumables and wastes premium currency.
- Check Concurrent Events: If a Soul-Awakening Gala or trading market runs alongside the scratchcard event, evaluate whether retiring or selling spare hero copies will supply the remaining CSG needed to hit a guaranteed milestone.
Step-by-Step Card Completion
Follow a consistent sequence when clearing boards to track milestone progress efficiently:
| Step | Action | Purpose |
|---|---|---|
| 1. Check Board Type | Inspect the reward pool on the active card | Confirm whether the board includes Grimoire or Star Soul drops |
| 2. Reveal Indicators | Scratch center or pattern-defining tiles first | Spot early multipliers or matching symbols |
| 3. Finish the Card | Reveal the remaining spaces on the card | Collect any tile payouts and register milestone points |
| 4. Track Progress | Check your total milestone points | Confirm how many cards remain until your target chest unlocks |
When to Stop Spending
The optimal stopping point is the exact moment you claim your targeted Primal Grimoire or Star Soul milestone chest. Continuing to buy scratchcards past a secured milestone tier to chase random 11x jackpots delivers poor value per gem spent.
Once you collect your rewards, assign Primal Grimoires to your primary damage dealers and key supports to refine speed ordering and survivability. Invest Star Soul materials directly into your primary Transcendence carry to unlock core skill passives, then save your remaining currency for the next major event cycle.
Free Idle Heroes Codes
Current active codes and how to redeem them.
Michael Smith
Michael covers live-service games, events, reward systems, and efficient daily routines, turning frequent updates into clear actions for players.
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Player Comments
151 players commented on this guide.
I wish I had read this before upgrading the wrong thing.
The explanation is clear, especially for beginners.
Can you add more details about heroes in a future update?
The tips are practical and easy to follow.