Stygian Onslaught is a special game mode in Genshin Impact that resets every patch with a new enemy lineup. In this mode, players must defeat three bosses with three different teams. After completing all difficulty levels in this mode, players can obtain Primogems, Mora, Hero's Wit, and Dust of Enlightenment materials.Recently, a leaker known as HomDGCat has shared details about the rumored boss lineup for the Stygian Onslaught game mode in the Luna IV version. This article discusses the latest leaks about the boss lineup for the Genshin Impact Luna IV Stygian Onslaught.All Genshin Impact Luna IV Stygian Onslaught bosses and mechanics, as per leaks6.3 Stygian Onslaught HP and Mechanics via HomDGCat byu/astrelya inGenshin_Impact_LeaksAs mentioned, a leaker known as HomDGCat has shared details about the rumored boss lineup of the Stygian Onslaught game mode in Luna IV version. According to these leaks, these enemies are rumored to be featured in the upcoming Stygian Onslaught game mode:Battlefield 1 Boss: Lord of the Hidden Depths: Whisperer of NightmaresBattlefield 2 Boss: Battle-Hardened Fireblade Shock Trooper: Forlorn HopeBattlefield 3 Boss: Emperor of Fire and IronBased on early leaks, the first boss is rumored to be released alongside a new map expansion in the upcoming Luna IV version. HomDGCat has also shared the details of the special mechanisms of these enemies. However, note that information on some mechanisms of these bosses is still incomplete. We will have to wait for further announcements by HoYoverse to learn more about these enemies.Also read: Genshin Impact Luna IV banners leakedThe section below provides detailed information about the mechanisms and HP of these bosses in the Luna IV Stygian Onslaught game mode:1) Lord of the Hidden Depths: Whisperer of NightmaresNot much information is known about this boss, since it is rumored to be released in the Luna IV version alongside the new area. However, HomDGCat has shared the details about its rumored mechanisms in the Stygian Onslaught game mode.Difficulty LevelBoss HPDifficulty 3 (Hard)1,415,539Difficulty 4 (Menacing)7,053,480Difficulty 5 (Fearless) 12,437,830Difficulty 6 (Dire) 23,658,108These are some mechanisms that this boss will gain for Difficulties 5 and 6 for the upcoming Luna IV Stygian Onslaught:The enemy will create a Deepdark Shield equal to 45% of its HP. When it is destroyed, the boss loses 20% of its HP and enters a weakened state, during which its RES to all elements is reduced to -60%.The boss will create Anglers during one of its special moves. Each defeated Angler reduces the shield's HP by 25%.The boss is immune to Physical attacks.It takes 300% of the original DMG when it is hit by Lunar Reaction DMG.Also read: Genshin Impact Luna IV new artifact sets leaked2) Battle-Hardened Fireblade Shock Trooper: Forlorn HopeRaskolnikov Local Legend in Genshin Impact (Image via HoYoverse)Also known as Raskolnikov, he is one of Nod-Krai's Local Legend enemies who was introduced to players during the Luna I version. This boss was also featured during the Stygian Onslaught game mode for the Luna I version. He generates three Electro shields at certain intervals during the battle. His shield takes increased Electro and Lunar-Charged DMG. Difficulty LevelBoss HPDifficulty 3 (Hard)956,661Difficulty 4 (Menacing)4,766,940Difficulty 5 (Fearless) 9,232,639Difficulty 6 (Dire) 17,195,518Here are some of its rumored mechanisms for the Difficulties 1-4: Multi-Shield: The opponent will generate three Electro shields while they are charging up the Thundering Suite move. The shield will repair itself at some regular intervals. Furthermore, after destroying all of his shields, the enemy will be paralyzed, and he will be unable to use Thundering Suite. Electro and Lunar-Charged Reaction DMG is more effective in destroying these shields. Additional Elemental Orbs will also be generated for each layer of shield that is destroyed. Thundering Barrage: When the boss activates this move, he will deal Electro DMG with a large AoE effect, and he will continuously unleash special Electro attacks. If his Thundering Suite move is prevented, then his equipment will malfunction, and his Electro RES will be decreased by a significant amount. The leaker has also shared some of the enemy's special mechanisms for the stages 5 and 6 in the Luna IV Stygian Onslaught game mode:The enemy will gain three layers of shield, with each of their HP being 4.5% of his max HP. The shield takes 200% increased Lunar-Charged DMG and 600% Electro-Charged DMG. During this state, the boss's RES to all elements except Electro will be increased to 60%. The shield has a unique self-repair ability that restores its HP at regular intervals. The self-repair function is almost paused after it takes Electro or Lunar-Charged DMG. After breaking all of his shields within a short time, his RES to all elements will be reduced by 50%. After the boss recovers, his Electro RES decreases by 60%.The boss will lose 6% of his HP after each shield is destroyed. The boss will generate 18 Electro Energy and six other Energy when each layer of shield is destroyed. Also read: Genshin Impact Luna IV Spiral Abyss enemies leaked3) Emperor of Fire and IronEmperor of Fire and Iron boss in Genshin Impact (Image via HoYoverse)The Emperor of Fire and Iron is a Boss introduced alongside the Fontaine region during the 4.0 update. The enemy has special Pyro Horns that increase its RES to all elements. These horns are infused with the Pyro Element, and a Hydro character can easily destroy them.Difficulty LevelBoss HPDifficulty 3 (Hard)781,267Difficulty 4 (Menacing)3,892,968Difficulty 5 (Fearless)9,115,430Difficulty 6 (Dire) 14,658,802HomDGCat has shared a few details about the rumored mechanisms of this boss for the Genshin Impact Luna IV Stygian Onslaught: The boss has 64U Pyro horns that increase its RES to all elements by 150%. It will lose 10% of its HP when these horns are destroyed. The opponent will summon special Sternshield Crabs that have 12U Pyro. After their Pyro depletes, they will hit the boss, and the boss will lose 12U of its Pyro shield. After the boss is hit, it takes damage based on the DMG taken by the Sternshield Crabs, equal to 60% of the Hydro DMG it takes, along with 10% of the other DMG taken. This value will not exceed 15% of the enemy's max HP. Also read: Genshin Impact Imaginarium Theater (February 2026) leaked