Seven Knights Re:BIRTH (SKRB) has dropped its final 2025 update, expanding the growth dungeons and introducing a fresh progression system: 'Potential'. To unlock this, you'll need the new 'Inner Ember' material, which is exclusively farmed in the expanded growth dungeons—hence why every adventurer is currently sweating over the 15th stage.

To save you the headache, KookminTree has compiled the recommended team compositions for 15th-stage dungeons into a single, handy infographic. Note that the Gold dungeon is absent here; since it doesn't drop elements, it's essentially a waste of your time. We've also included a quick breakdown of the core mechanics for each element, along with some universal tips for tackling these dungeons.

Q. For a fresh adventurer, which 15th-stage dungeon is the best starting point?
A. We recommend the 'Light' attribute, as you can clear it with lower-grade heroes.

If you are a newcomer to SKRB, your focus will naturally be on the adventure content. But once you hit a wall, the growth dungeons are your logical next destination. It’s the standard loop: upgrade your heroes, then push back into the higher-difficulty territories. So, where should you start?

Unless you are specifically hunting for a particular elemental material, the Light dungeon is your best bet due to its lower barrier to entry. You can comfortably clear up to stage 15 using only base-grade characters. Because the gimmick revolves around hit counts rather than raw stats, you don't even need to heavily invest in your heroes—you can clear it with a 'stock' team.

This is especially true if you are hunting for 'Inner Ember' to unlock Potential. While it’s a shame that you only get Light elements for your breakthroughs here, the efficiency and speed of the clear make it the most reasonable choice when other dungeons feel like a slog.

Q. If I want to clear all elemental dungeons at stage 15, which heroes are must-haves?
A. Prioritize the versatile duo: Lina and Biscuit.

Look at the summary image, and you'll notice Lina and Biscuit appear in every team except the Light attribute. Lina is the undisputed queen of recovery, while Biscuit provides essential firepower and a unique passive that reduces incoming damage for '5-man attack' units. In the long-winded battles of these growth dungeons, they are simply invaluable.

If you absolutely had to pick just one, I’d lean towards Biscuit. Lina’s healing can occasionally be substituted with Evan’s shields or Yui’s resurrection, but there is simply no replacing Biscuit. Honestly, since growth dungeons are all about manipulating the core gimmicks, the damage increase from Biscuit is minor; the real value is her passive, 'Blacksmith’s Reinforcement', which works wonders even without micromanaging your skill rotations.

Another perk is that both Lina and Biscuit are supporters. This means they don't require the same high-level investment as your main DPS. If you pull a 4-star Biscuit, just evolve her to 6-star and max out her ultimate. Slap some gear on her, and she’s ready for the frontline immediately.

Q. Excluding the Gold dungeon, which attribute should be left for last?
A. The 'Earth' attribute is tricky and lacks useful targets, so tackle it only when you have spare resources.

If there is one hero type currently underperforming in SKRB, it’s the 'Defense' type. Check the codex—there are few of them, and they aren't exactly dominating the current meta in the Arena. Even in high-difficulty content like the Tower of Infinity, defense heroes aren't pulling their weight. Consequently, Earth elements, which are used to upgrade them, aren't exactly in high demand.

To make matters worse, the Earth growth dungeon is a nightmare. The boss, 'Rock-Eating Pookie', lives up to its name with massive defense, and its skill damage scales based on that defense. Since all growth dungeons share the same entry tickets, I’d suggest prioritizing other elements before wasting your effort on a dungeon that provides materials for heroes you likely won't be using.