boss guide 2026-05-15 · 1,581 words

Sam HSR: How to Beat the Boss & Best Teams (June 2026)

Facing the Stellaron Hunter: Sam is a trial of fire that tests your team’s Skill Point management and survival under extreme healing pressure. As one of the most mechanically demanding encounters in Honkai: Star Rail, understanding the “Secondary Combustion” state is the difference between a quick victory and a total party wipe.

Stellaron Hunter: Sam is a high-intensity boss encounter first introduced in the Penacony arc. Known for high Fire damage and a unique debuff that renders traditional healers nearly useless, Sam requires a shift in strategy toward shielding and aggressive Weakness Breaking. This guide provides the statistical breakdown, attack patterns, and team compositions needed to extinguish the flames of the Fourth Stellaron Hunter.

Boss Stats

Sam is designed to punish teams that rely solely on passive sustain. With a massive HP pool and a native resistance to Fire, players must pivot to Lightning, Quantum, or Imaginary damage dealers to find success.

Stat Type	Level 80 Base Value (Approx.)
HP	1,225,000 (MoC scaling applies)
ATK	3,200
DEF	1,100
SPD	132
Toughness	480
Fire RES	40%
CC RES	50%

Sam’s Elemental Weaknesses

Sam is weak to Lightning, Quantum, and Imaginary damage. Because Sam’s Toughness bar is “Protected” during the initial phase of the fight, you cannot inflict a Weakness Break immediately. You must wait for the boss to enter the Secondary Combustion state to begin depleting the Toughness bar. This makes characters like Acheron, Dan Heng • Imbibitor Lunae, and Dr. Ratio exceptionally valuable for this fight.

Resistances and Immunities

As a mechanical suit designed for high-heat environments, Sam possesses a 40% Fire Resistance. Using Fire-based DPS characters like Himeko or Topaz is highly discouraged, as their damage output will be significantly throttled. Additionally, Sam has a 50% Control RES, making it difficult to land freezes or stuns. While not immune to all status effects, Sam is immune to Entanglement and certain movement-restricting debuffs while in specific states.

Attack Patterns

The battle against Sam is divided into two distinct phases: the “Weakness Protected” neutral state and the “Secondary Combustion” enhanced state.

Phase 1: Weakness Protected State

In this phase, Sam’s Toughness bar is greyed out. You cannot reduce his Toughness, meaning you cannot trigger Weakness Break effects or delays. Sam uses basic offensive maneuvers to chip away at your team’s HP and build energy for his transformation.

BHF: Fire Offensive: A single-target lunge that deals Fire damage to one ally. This is Sam’s most common move and serves to build up the boss’s energy.
BBHF: Scorched Earth: A multi-target attack where Sam leaps into the air and slams down, dealing Fire damage to the primary target and adjacent allies.
SGE: Molten Core: This is a passive talent active throughout the fight. It “combusts” your Skill Points. When an ally uses a Skill Point, they take Fire damage equal to a percentage of their Max HP. However, using these points is the only way to counter Sam’s next phase.

Phase 2: Secondary Combustion Mechanics

When Sam’s energy is full, he uses DHGDR: Secondary Combustion. Sam enters an enhanced state, setting the entire battlefield on fire.

Healing Reduction: While Secondary Combustion is active, all allies receive a 90% reduction in outgoing healing. This means healers like Natasha, Lynx, or even Huohuo will struggle to keep the team alive.
Molten Energy Stacks: Sam gains 5 stacks of Molten Energy. To end this phase, you must use Skill Points to attack Sam. Each attack that consumes a Skill Point removes one stack.
DHGDR: Supernova Overload: If Sam is not Weakness Broken or if the Molten Energy stacks are not removed within a set number of turns, Sam executes a massive AoE strike. This attack deals lethal damage to most non-Preservation characters.
Weakness Protection Removal: During Secondary Combustion, Sam’s Toughness bar is finally revealed. Breaking Sam’s Weakness while he is in this state will immediately end Secondary Combustion, deal massive damage to the boss, and recover all Skill Points for your team.

Step-by-Step Strategy

Beating Sam requires a departure from standard “safe” playstyles. You must embrace the damage taken from combusted Skill Points to force the boss out of his enhanced state.

Managing the Healing Reduction Debuff

The 90% healing reduction is the most dangerous aspect of this fight. If you rely on Luocha or Bailu, you will find that their heals barely move the HP bar. The solution is to use Preservation characters. Shields are not affected by the healing reduction debuff. Aventurine and Gepard are the premier choices here, as their shields provide a buffer that prevents Sam from ever touching your actual HP pool. If you must use a healer, ensure they have high-frequency cleansing or emergency damage reduction, though shielding remains the superior mitigation strategy.

Breaking the Molten Energy Stacks

Once Sam enters Secondary Combustion, your priority shifts entirely to stack removal. You need to use Skill Points to attack Sam.

Save SP: Before Sam transforms, try to cap your Skill Points at 5.
Aggressive Spending: Even if your characters are low on HP, you must use their Skills to attack Sam. Using a Skill Point to attack Sam removes one Molten Energy stack.
Ultimate Timing: Save offensive Ultimates that can reduce Toughness (like Acheron’s or Dan Heng • Imbibitor Lunae’s) for this phase. While Ultimates don’t consume Skill Points to remove Molten Energy stacks, they do contribute to Weakness Breaking, which is the alternative way to end the phase.

Survival Tips for Supernova Overload

If you cannot break the stacks or the Toughness bar before Sam’s turn comes back around for Supernova Overload, you must prepare for impact.

Damage Reduction: Use abilities like Fu Xuan’s Matrix of Prescience or the Preservation Trailblazer’s damage reduction to soften the blow.
The “Dispel” Mechanic: When you successfully remove all 5 Molten Energy stacks by using Skill Points, Sam takes damage equal to 15% of his Max HP and the field returns to normal. This also restores 5 Skill Points to your team, allowing for a massive counter-attack.

Recommended Team

The best teams for Sam prioritize shielding and high-frequency Skill Point usage paired with Lightning, Quantum, or Imaginary damage.

Best Premium Teams

These compositions utilize high-rarity units that specifically bypass Sam’s defensive mechanics.

Role	Character 1 (Lightning Focus)	Character 2 (Imaginary Focus)	Character 3 (Quantum Focus)
Main DPS	Acheron	Dan Heng • Imbibitor Lunae	Seele
Sub-DPS/Support	Silver Wolf	Welt	Sparkle
Support	Ruan Mei	Robin	Pela
Sustain	Aventurine	Gepard	Fu Xuan

Aventurine is the absolute MVP for this fight. His shields refresh automatically and are not impacted by the healing debuff. Furthermore, his follow-up attacks contribute to Toughness reduction if Sam has an Imaginary weakness. Acheron is also top-tier because her Ultimate ignores Weakness types, allowing her to deplete Sam’s Toughness bar even if Silver Wolf hasn’t applied a Lightning weakness yet.

Best F2P Teams

For players without limited 5-star sustains, a double-Preservation setup is often safer than a solo-healer setup.

Main DPS: Serval (Lightning AoE and Break)
Sub-DPS: Qingque (Quantum DMG, high SP consumption helps break Molten Energy stacks)
Sustain 1: Trailblazer (Preservation) (Shields and Taunt)
Sustain 2: March 7th or Lynx (March provides targeted shields; Lynx provides HP Max buffs that aren’t technically heals)

In this F2P setup, Serval and Qingque focus on the Lightning and Quantum weaknesses. The Preservation Trailblazer should use their Skill every turn to maintain damage reduction for the team, which also helps remove Sam’s Molten Energy stacks.

Key Characters to Avoid

Fire DPS (Himeko, Topaz, Hook): Sam’s 40% Fire RES makes these characters significantly less effective.
Pure Healers (Bailu, Natasha): While they can work in lower difficulty settings, the 90% healing reduction in high-level Memory of Chaos makes them almost dead weight during the most critical part of the fight.
Low SP Users: Characters that only use Basic ATKs (like certain builds of Blade) will struggle to remove Sam’s Molten Energy stacks quickly enough.

Loot

Defeating Sam is necessary for progressing the Penacony storyline and for farming specific high-level materials.

Stagnant Shadow Rewards

The Stagnant Shadow: Shape of Roast is the primary location to farm Sam for character ascension materials.

Material	Quantity (Eq. Level 6)	Primary Use
Raging Heart	5	Ascension for Firefly
Credits	[information unavailable]	General Currency
Trailblaze EXP	150	Account Leveling

Raging Heart is the core drop from this encounter. As of the current version, it is the primary material required to ascend Firefly. Players planning to pull for Firefly should stockpile at least 65 of these materials.

Simulated Universe & MoC Drops

In the Simulated Universe (specifically World 9 or Divergent Universe), Sam may appear as a final boss or an elite encounter.

Planar Ornaments: Defeating Sam in the Simulated Universe allows you to spend Immersifiers for Planar Ornaments like the Izumo Gensei and Takama Divine Realm set.
Memory of Chaos: When Sam appears in the Memory of Chaos, he is often paired with high-HP mobs. Clearing this floor grants Stellar Jades and Lucent Afterglow, which can be traded in the Light Cone Manifest store.

By focusing on shielding over healing and aggressively spending Skill Points during the Secondary Combustion phase, you can turn Sam’s own mechanics against him and secure a victory.

Sources

Honkai: Star Rail Fandom — https://honkai-star-rail.fandom.com/wiki/Stellaron_Hunter:_Sam
Prydwen Institute — https://www.prydwen.gg/star-rail/guides/
Game8 Boss Guide — https://game8.co/games/Honkai-Star-Rail/archives/443313
Honey Hunter World — https://hsr.honeyhunterworld.com/sam-monster/

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