The Solo leveling the franchise has enjoyed unprecedented popularity over the past two years, and it's in large part thanks to Studio A1 Pictures' incredible adaptation, which, thanks to a phenomenal cast, brilliantly brought to life the story of Sung Jinwoo, which author Chugong wrote as a web novel in 2016. So far, Solo Leveling has released 25 episodes spanning two seasons, both of which deliver absolutely stellar quality.
The story of Solo leveling is primarily focused on battle, and each subsequent episode gives fans a glimpse of a new battle of the highest quality. While the plot itself may not be the richest, the fights themselves are worth watching. That's exactly why the next anime season of this brilliant story will shoot the popularity of the series through the roof by introducing one of the most incredible upgrades for the protagonist, Sung Jinwoo, in the form of Black Heart as the series tries to tackle the Double Dungeon arc.
Solo Leveling Season 3 will officially introduce Sung Jinwoo's Black Heart Transformation in The Double Dungeon Arc
Solo Leveling Season 2 ended with the adaptation of the Jeju Island Arc, and from now on, the series will feature several mini-arcs in Season 3 in the form of the Recruitment Arc and the Ahjin Guild Arc. The first main arc after the conclusion of the Jeju Island Arc is the Double Dungeon Arc, in which Sung Jinwoo returns to battle at the highest level with immense power.
In the Double Dungeon Arc, especially towards the end, Solo Leveling introduces a new power-up that completely breaks the scaling in the world itself. After meeting Jinwoo with Ashborn, the protagonist receives the power of the Black Heart. Overall, this Black Heart takes him to a whole new level of power, making him a force to be reckoned with and essentially marking the birth of the True Shadow Monarch, something fans have been eagerly awaiting.
The 8 Most Brutal Solo Leveling Fights, Ranked
The fights in Solo Leveling are a spectacle that you have to see to believe, but they can also be very brutal, especially in the case of these fights.
Judging Jinwoo's Black Heart Strength
Originally, Sung Jinwoo's Black Heart belonged to none other than Ashborn, the True Shadow Monarch, who will be featured in Solo Leveling Season 3 when it officially drops on Crunchyroll. Later, the main character of the series, Sung Jinwoo, inherits this power.
I am the record of your struggles, the proof of your resistance, and the reward for your suffering. I am death, I am eternal rest, I am horror. — Ashborn, Solo Leveling Manhwa Chapter 161
The Black Heart is essentially a mass of black flames with a purple core that grants immense power to those who wield it. When Jinwoo achieves this power from Ashborn, he gains a +100,000 boost to his mana, giving him an inexhaustible pool of energy. Using this power, Jinwoo can use as many shadows as he wants and continuously regenerate them, as well as summon more without limit. The power of the Black Heart basically means that Sung Jinwoo has advanced to the rank of True Shadow Monarch, making him one of the most powerful individuals, not only in solo leveling, but in the entire anime.
Who is that character?
Identify the silhouettes before time runs out.
Start
Identify the silhouettes before time runs out.
Easy (7.5s) Medium (5.0s) Hard (2.5s) Permadeath (2.5s)
Why Jinwoo's Black Heart is one of anime's most iconic transformations
Solo Leveling isn't known for having the richest stories or deepest lore, but it's still an incredibly exciting anime series. In fact, Solo Leveling is one of the most popular anime in the modern era, which is officially supported by data from Crunchyroll, where it is the most watched and reviewed anime on the platform, despite only being around for two years. Solo Leveling has competed against giants like My Hero Academia, One Piece and Naruto and still managed to hold its own. It even won Crunchyroll's Anime of the Year 2025 after a stellar first season.
It's clear that Solo Leveling represents a modern world-shaping anime phenomenon. Along these lines, Solo Leveling the main character achieving the Black Heart's size increase, which is his most iconic power in the manhwa, will surely create an amazing moment that all fans will remember for years to come. This power-up is already iconic in the manhwa community, but seeing it animated and brought to life will elevate it to a whole new level and increase its popularity even more.
All episodes of Solo Leveling are currently available to stream on Crunchyroll.
