Here is a guide on the best teams for Challenge Mode of the Key to the Heart Beast Raid in Cookie Run Kingdom.
The Challenge Mode for the Key to the Heart Beast Raid in Cookie Run: Kingdom is currently ongoing. This higher difficulty puts your cookies to their limits with a much tougher boss that packs quite a punch. On top of that, the boss deals true damage, so damage resistance will not help you much.
I’ll be real with you, Challenge Mode difficulty is for end-game players. You will struggle a lot to clear this without near-maxed-out lab upgrades and cookies. But if you want to try your luck, here is a guide on which cookies you need to invest in to clear the Key to the Heart Beast Raid in Cookie Run Kingdom.
Best cookies and build for Key to the Heart Beast Raid in Cookie Run Kingdom
Without further ado, here are the two teams you need to form for the two phases of the Warden of Heart beast raid boss:
Team 1: Poison Team

For the Poison Team, obviously, you need units that can deal Poison DMG. This is where you will need Eternal Sugar Cookie as your main DPS with a few supports to back her up. Make sure Pure Vanilla is the leader for the Rally Effect.
Build Eternal Sugar Cookie Black Sapphire Cookie Pure Vanilla Cookie Cream Puff Cookie Cream Ferret Cookie | Toppings Full Raspberry ATK Full Peanut HP Full Chocolate Coolown Full Apple Jelly Crit Full Chocolate Coolown | Topping Substats ATK, Cooldown, Crit HP, Cooldown Cooldown, HP, DMG Resist HP, Cooldown Cooldown, Crit | Beascuits Poison DMG Poison DMG DMG Resist, Cooldown HP, Cooldown Cooldown, Crit, HP | Magic Candy N/A N/A N/A At Least Level 10 N/A |
As for the treasure, go for Dream Conductor’s Whistle, Twinkling Starlight Crown, and Vial of Raging Dunes.
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Team 2: Steel Team

For the second team, you need to have cookies that deal Steel DMG. This is where Awakened Hollyberry and Raspberry Cookie shine. Make sure Hollyberry Cookie is the leader for the Rally effect.
Build Awakened Hollyberry Cookie Raspberry Cookie Linzer Cookie Sugarfly Cookie Pavlova Cookie | Toppings Full Raspberry ATK Full Raspberry ATK Full Caramel ATK SPD Full Raspberry ATK Full Raspberry ATK | Topping Substats Cooldown, ATK, HP Cooldown, ATK, HP Cooldown, HP, DMG Resist Cooldown, HP, DMG Resist Cooldown, HP, DMG Resist | Beascuits Steel DMG Steel DMG ATK SPD, HP Cooldown, HP, DMG Resist Cooldown, HP, DMG Resist | Magic Candy N/A At Least Level 20 N/A N/A N/A |
For the treasures, go for Mystical Silver Fork, Sleepyhead’s Jelly Watch (or Squishy Jelly Watch), and the Old Pilgrim’s Scroll (or Disciple's Magic Scroll).
That sums up our Cookie Run: Kingdom guide for the Beast Raid Key to the Heart Challenge Mode. For more news and guides, stick around on esports.gg.