Today, we have a brand-new Event Augment. We're really excited for this Augment to shake up the final week of our Simril Event, allowing players to put their formation strategy skills to the test and push as far as they can go to show their true Mastery!
As you set up your best possible formations in the Challenge Adventure, you can collect Mastery Gems. This new currency is used to purchase a new type of prestige cosmetic that you can collect for Event Champions: Card Sleeves!

To learn more, read on...
Welcome to Mastery Challenges
The Simril Mastery Challenge will go live at Noon PT today. It will be active until the end of the Simril Event (12/24 at Noon PT). It is accessed from the new notification at the top of the game, either in an Adventure or from the campaign map.
This Mastery Challenge uses the Simril Spoilsport Adventure, with Lark's formation. At first, only the Base Restriction ("Center of Attention") is available. However, there are four Optional Restrictions that you can eventually add to your Challenge Adventure. These Optional Restrictions increase the Adventure's difficulty and are necessary to collect Mastery Gems
Base Reward: Event Token Rewards
You'll earn 10 Event Tokens for every area completed in this Mastery Challenge, up to area 2,500. You'll only earn the Event Tokens per completed area once during this Mastery Challenge, so if you complete area 2,000 with the Base Restriction enabled and collect the Event Tokens for completing areas 1-2,000, you won't start earning additional Event Tokens in this Mastery Challenge until you complete area 2,001+ on later runs.Unlocking Optional Restriction Slots
Your first step in the Mastery Challenge is to run the Simril Spoilsport Adventure with the Base Restriction to unlock your Optional Restriction Slots.- For every 500 areas you complete in a Mastery Challenge (with any restriction active), you'll unlock one of a total of 4 Option Restriction Slots. Those Slots allow you to toggle on Optional Restrictions for future Mastery Challenge runs. Note: When a Mastery Challenge is active in the future, Optional Restriction Slots that have already been unlocked in previous Mastery Challenges will remain unlocked.
Mastery Reward: Mastery Gems
After you complete your initial Challenge Adventure and unlock one or more Optional Restriction Slots, you can start adding those Optional Restrictions to your Challenge Adventures to collect Mastery Gems!You can earn up to 1 Mastery Gem for each area completed, based on the number of Optional Restrictions enabled. It doesn't matter which Optional Restriction is enabled, just that you have completed an area with X or more enabled.
- For example: If you complete area 1,000 with 1 Optional Restriction enabled, you'll collect 1,000 Mastery Gems when you reset that Adventure. If you complete area 1,500 with 2 Optional Restrictions enabled on a future run, you'll collect a total of 2,000 Mastery Gems (1,500 Mastery Gems for 2+ Optional Restrictions enabled, PLUS an additional 500 Mastery Gems because you've now completed up to area 1,500 with 1+ Optional Restrictions enabled as well).
Spending Your Mastery Gems: Card Sleeves!
With this Mastery Challenge, we are introducing a new prestige cosmetic that you can use to bling out the Equipment cards of Event Champions: Dragonsoul Card Sleeves!Dragonsoul Card Sleeves are currently available for each Simril Event Champion in the Event Shop Tab, for a total of 2,000 Mastery Gems each. That means by proving your Mastery of Simril, you can purchase Card Sleeves for up to 5 of the following Champions: Dhadius, Halsin, Krull, Lark, Lucius, Nordom, Regis, Shadowheart, Talin, Warden, Warduke, and Yorven.
Once purchased, the Dragonsoul Card Sleeve is automatically equipped, but it can be toggled off or on via the Champion Page near where you equip Skins. Once equipped, Card Sleeves can be seen in the following locations:

When you open Chests and collect equipment for that Champion.
When you view the Champion's equipment on the bench, or on the Champion Page
You can collect up to 2,500 Mastery Gems for each number of Optional Restrictions enabled. Reaching 2,500 is a top-tier goal, and isn't something we expect most players to achieve - after all, this is a Mastery Challenge.
Every milestone you reach is meaningful progress. If you don't quite make it to the next milestone, any Mastery Gems you've earned will remain in your inventory and help jump-start your progress in the next Mastery Challenge. Every run makes you stronger, and every Mastery Gem earned puts you one step closer to your next Card Sleeve when this augment returns!
FAQ
What are Mastery Challenges?- Mastery Challenges are a limited-time system where you can run Challenge Adventures to earn rewards by building efficient and powerful formations. By enabling Optional Restrictions, you can also earn Mastery Gems, which can be spent on a brand new prestige cosmetic type to deck out the equipment cards of various Champions: Card Sleeves!
What can I earn from Mastery Challenges?
- You can earn Event Tokens by completing areas in the current Challenge Adventure. The number of Event Tokens you will earn is based on the highest area completed across all of your runs during the current Mastery Challenge. Once you've claimed the Event Tokens for a particular area, you cannot claim the Event Tokens for that area again in a subsequent attempt during this Mastery Challenge.
By enabling Optional Restrictions, you can also earn Mastery Gems, again based on the highest area(s) you have completed in your attempts using one or more Optional Restrictions.
To gain the maximum rewards from a Mastery Challenge, you must reach the max area (currently 2,501) with all of the Optional Restrictions enabled. This is *not* a task that most players will be able to accomplish!
What are Optional Restrictions
- Optional Restrictions are additional, challenging restrictions that you can opt into for the Challenge Adventure. Before you can attempt any Optional Restrictions, you must unlock Restriction Slots, which you do by reaching area milestones with the Base Restriction enabled. You can enable multiple Optional Restrictions at once, up to the number of Restriction Slots you have unlocked. You will earn Mastery Gems for completing areas based on the number of Optional Restrictions enabled. You can choose any combination of Optional Restrictions to attempt at once, and you will earn currency based on the number of Optional Restrictions chosen, not the specific Optional Restrictions that are enabled.
What are Mastery Gems?
- Mastery Gems are a new type of currency only collectable through a Mastery Challenge. They can be spent on a brand new cosmetic type to deck out the equipment cards of Champions you love: Card Sleeves!
What are Card Sleeves and how do they work?
- Card Sleeves are a new card border that you can collect for certain Champions during the Mastery Challenge. This new cosmetic will accent the look of the equipment cards that Champion has! You can equip or remove them from the Champion Page, near where you equip Skins. You can only purchase Card Sleeves for Champions from the current Event.
Do I have to purchase the Card Sleeves during the Mastery Challenge? Can I wait a few weeks?
- Card Sleeves are available on the Event tab of the Shop, and you can purchase Card Sleeves for any current Event Champions. They are currently available for purchase only while the Mastery Challenge is active.
Do Mastery Gems go away at the end of the Mastery Challenge?
- No! Just like the Optional Challenge Restriction Slots that you can unlock during this Mastery Challenge, the Mastery Gems you earn are yours. You can spend them on Card Sleeves during this Mastery Challenge, or you can hold onto them for another Mastery Challenge to get sleeves for other Champions! If you have any Mastery Gems remaining, they will remain in your inventory.
When is the next Mastery Challenge Scheduled?
- At this time, the Mastery Challenge is an Event Augment. As with all Augments, we plan to review player feedback before determining when Mastery Challenges will next appear!
Mastery Challenges & Card Sleeve Feedback
We're excited to hear what the community thinks about the Mastery Challenge Augment and the new Card Sleeve cosmetic! Your feedback is important to us, and we would love to have you join our community on one of our official platforms to share your thoughts:- The Official Idle Champions Discord.
- The Official Idle Champions Subreddit.
- Follow us on Twitter, Facebook, Bluesky, or Instagram.