In the Anime Vanguards Update 6.5, a powerful new secret unit has been introduced—Slime (Rimuru). Unlike most units available through standard banners or events, Rimuru can only be obtained by unlocking and completing the Secret Slime Portal, making it one of the most coveted additions in this update.
This guide covers everything you need to know to get Rimuru, from farming the portal to collecting materials required for his evolution.
What Is the Secret Slime Portal?
The Secret Slime Portal is not immediately available to all players and cannot be accessed directly. Instead, it is a rare drop with a 0.5% chance from completing Spring Portal Tier 10 runs.
To begin the journey:
Play Spring Portal events until you reach Tier 10.
Every successful completion of Tier 10 gives you a 0.5% chance to receive the Secret Slime Portal.
This is the only known way to unlock the Slime challenge.
Because of the low drop rate, players should expect to grind multiple times unless extremely lucky. However, the portal is farmable and does not require Robux or premium access, making it an obtainable goal for F2P players with patience.
What to Expect Inside the Slime Portal
Once the Secret Slime Portal is unlocked, players can enter a 20-wave challenge featuring Rimuru-themed enemies. Fortunately, this portal is less difficult than previous secret content in the game.
Key Details:
Waves: 20
Estimated Completion Time: Under 10 minutes with a strong team
Recommended Unit: Sung Jin-Woo is highly effective, though other solid damage units can carry the run.
Visual Tip: You can turn off visual effects if they interfere with clarity or performance.
It’s important to note that completing the portal does not guarantee that you will receive Rimuru. The unit drop is still controlled by RNG, meaning some players might need to repeat the portal multiple times to get the unit.
How to Evolve Slime (Rimuru)
After you successfully obtain Slime, you’ll gain access to the evolution pathway for the unit. Fortunately, unlike some units that require complex crafting processes, Rimuru’s evolution is fairly straightforward.
Required Evolution Materials:
Anti Magic Mask – Automatically provided once the unit is unlocked. No crafting needed.
Shamrock
Green Essence Stone
Blue Essence Stone
Red Essence Stone
Rainbow Essence Stone
These items are generally acquired through various in-game activities such as portal drops, crafting systems, or other seasonal events. Most players who have been actively farming Spring content will likely already have a portion of these materials.
The Anti Magic Mask, which is often a rare item for other evolutions, is conveniently granted immediately upon unlocking Rimuru. This allows players to focus on gathering the essence stones and Shamrock to complete the evolution.
Final Thoughts
The Slime (Rimuru) unit from Anime Vanguards Update 6.5 is one of the most accessible secret units added to the game so far. While the Secret Slime Portal has a low drop rate, the challenge inside is relatively easy and quick to complete—especially for players with strong units like Sung Jin-Woo.
Although RNG still plays a role in whether you’ll get Rimuru after finishing the portal, the absence of extreme difficulty makes the farming process much more manageable for casual players.
Once unlocked, Rimuru’s evolution process is smooth, and the inclusion of the Anti Magic Mask as a free reward removes one of the biggest hurdles for upgrading secret units. With unique abilities and the prestige of owning a secret character, Slime (Rimuru) is a worthy addition to any serious Anime Vanguards roster.