I am Lech Kril. My hammer awaits your skull.
—Lieutenant Lech Kril

Lieutenant Lech Kril is the Grineer boss of Mars, and a dual boss on Ceres alongside Captain Vor. A revered war hero clad in impenetrable armor and armed with a Gorgon Gorgon and his signature Brokk hammer with DmgColdSmall64 Cold/DmgFireSmall64 Heat abilities, Lech Kril is a formidable adversary for anyone who opposes him.

  • On War, Mars, a successful assassination will reward ExcaliburIcon272 Excalibur's components.
  • On Exta, Ceres, a successful assassination will reward FrostIcon272 Frost's components and either Miter Miter parts or TwinGremlins Twin Gremlins blueprint.



Lieutenant Lech Kril is a revered war hero among the Grineer empire stationed in War, Mars, who wields a hammer and a cryo-bag which he effectively uses to lethal effect.

His reputation preceded him to the point that while his assassination will result in increased stability for the solar system and intimidate the rest of the Grineer, it may also make him a martyr to his people.


Lech Kril once had a quarrel with a member of the Nightwatch Corps named Gorth for killing his close ally under the reason of "stealing supplies". The Nightwatch marine eventually suffered a political fallout that destroyed his career, exiling him of any further military service. Gorth now works under the Rathuum as an Executioner to redeem his honor.

Operation: Arid Fear[]

Though Lech Kril plays no part in Operation Arid Fear – a Tenno operation to uncover the Grineer's hidden settlement, of which the former succeeded on – he was later assigned by Captain Vor to assist him in protecting the revealed settlement in Mars (now moved to Ceres for gameplay reasons).


Lieutenant Lech Kril wears a unique set of body armor and wields the Gorgon Gorgon and Brokk.


  • Gorgon Gorgon: A fully automatic machine gun with a high fire rate thanks to its spool-up. Kril uses this at range to mow down his enemies.
  • Brokk: A large hammer that Kril swings with immense force against Tenno that move too close to him. In Phase 1, his swings do DmgColdSmall64 Cold damage, while in Phase 2 they do DmgFireSmall64 Heat damage
  • Ice Wave: Used exclusively during Phase 1, Kril slams the ground with his Brokk, creating a wave of ice that deals DmgColdSmall64 Cold damage.
  • Fire Wave: Used exclusively during Phase 2, Kril slams the ground with his Brokk, creating a wave of fire that deals DmgFireSmall64 Heat damage.
  • Flame Barrier: Used exclusively during Phase 2, if Kril cannot reach his target for whatever reason (such as standing on a highwire) Kril surrounds himself in a sphere of flames, to render himself invulnerable.
  • Charge: Used exclusively during Phase 2, Kril charges forward, knocking down his opponents.
  • Hammer Throw: Used exclusively during Phase 2, Kril throws his hammer like a boomerang.


Phase 1[]

Lech Kril engages with a Gorgon Gorgon at range and will occasionally swing his Brokk hammer that deals DmgColdSmall64 Cold damage when Tenno get too close. He is invulnerable to all damage, but the four coolant pipes on his back can be shot off by damaging the coolant pack. The coolant pack is highlighted in a neon blue color, which then turns neon red when one of the tubes is loose and flailing about, spewing white foam.

When the first coolant pipes is dislodged, he will hammer the ground and freeze himself, becoming vulnerable to damage. However, he will thaw out after receiving a small amount of damage (or after several seconds if the damage threshold is not met), and the process must be repeated. He will also thaw if you deal any DmgFireSmall64 Heat damage to him.

Phase 2[]

Once all four of his coolant pipes are destroyed, Lech Kril bursts into flames. He stops using his Gorgon and all his Brokk attacks are now DmgFireSmall64 Heat-based and can now Charge and Hammer Throw, along with a significant increase to his mobility and attack speed.

With his entire body now vulnerable to damage, the Tenno only need to shoot Kril until he is defeated while carefully avoiding his empowered attacks.


  • Phase 1: Shoot the coolant pack on his back when it is neon blue, then attack Kril after he freezes himself with an overhead hammer swing. Shooting anywhere but the coolant pack will have no effect, and after a certain amount of time the coolant pack will return to its red color if not shot in time. Repeat until all four pipes are dislodged. Kril uses a Gorgon Gorgon and DmgColdSmall64 Cold melee attacks.
  • Phase 2: Attack Kril until he is defeated. Kril exclusively uses DmgFireSmall64 Heat melee attacks.


  • Before Update 7.0 (2013-03-18), Kril resembled a larger Grineer Butcher, and wielded a Fragor Fragor instead.
  • Kril appears in the Warframe Open Beta trailer, though still wielding the Manticore, rather than the current Brokk.
  • He was the first boss to undergo a major revamp, receiving a more complex boss battle and unique voice-acting and animations.
  • Prior to Update 7.5 (2013-03-28), he used the Manticore instead of the Brokk.
  • He also was the first boss to have a special death animation. Prior to Update 8.0 (2013-05-23), on death, he would fall flat on the ground like a downed player before actually dying. It took a little time for him to bleed out on his own, but one could finish him to shorten the time. After Update 8, he now has a new death animation where he falls to his knees and collapses before erupting in a fiery explosion.
  • Lieutenant Lech Kril's taunt "And I will strike down upon (player name) with great vengeance and furious anger!" Is a reference to a scene in Pulp Fiction, in which Samuel L. Jackson states the same as a quote from the Bible's book Ezekiel 25:17 (Which was a dramatized version from the original Bible quote, "And I will execute great vengeance upon them with furious rebukes; and they shall know that I am the LORD, when I shall lay my vengeance upon them.")
  • As of Update 11.0 (2013-11-20), his shields can be damaged during Phase 1. Prior to the recent status rework (update number needed) the bleeding effect from Slash-based weapons could directly damage his health, despite him being invulnerable.
  • His rank is somewhat unusual for a supposed 'war hero', as Lieutenants are generally lesser-ranking commissioned officers in current military terms, only three or four steps above the lowest possible rank. It is possible that Kril has not been an officer for long - possibly receiving promotion to commissioned officer from an enlisted rank - or that Grineer officers are assigned their ranks/titles on a different basis; perhaps based off the size of the force they command or their overall long-term experience, rather than personal combat experience. Alternately, his status as a war hero may be entirely fabricated as a propaganda campaign, and his title/rank chosen on purpose.
  • His armor (and possibly body) is preserved and displayed inside Kuva Fortress, alongside with other various artifacts.


  • While facing Lieutenant Lech Kril on War, Mars, it is possible to make him stuck under the elevator. Doing so renders the fight trivial.
  • When using Fire Wave or Ice Wave, the effect of his hammer impacting the ground will instead appear at the end of the ability. There are also no visual effects for Lech Kril pulling out his hammer after Ice Wave is used.
  • When damaged by a Puncture proc, the effect will never go away. This may apply to other procs.
  • Upon death, the explosion effect will trigger when all his health is lost, instead of when his body disappears, making it seem like his corpse vanishes from thin air. (It appears this only occurs when bug 6 also occurs.)
  • After the cutscene on Ceres, Lech Kril may wield his Brokk like the Gorgon for a moment. After the cutscene on Phobos, Kril will wield his Gorgon like the Brokk.
  • If any animation other than shooting and/or walking is playing when you destroy one of Lech Kril's coolant tubes, he will not flail around in a daze.
  • When his final coolant tube is destroyed, Lech Kril can still take damage after being unfrozen, and before beginning his second phase. This is exploitable to significantly shorten the fight during Phase 2.
  • When beginning his second phase, the burning ground and death explosion effect will play, along with what should only be the heat proc-esque effect.
  • When Lech Kril melee attacks you using his hammer with only one arm, the swinging sound effect will play a second time as he brings it back to holding position. When he is in his first phase, the Gorgon teleports into his hand when the second swinging sound effect plays.
  • Lech Kril will continue to speak to the player on Phobos even after he's been killed in the fight, so long as Vor remains. The same goes for Vor if Kril is still alive.
  • His "second-skin" quote has a typo, as "second-skin" should not be hyphenated.
  • During his transmissions, he is in his second phase, even though he always begins in his cold based first phase. This is also weird since ice can be seen in the background.
  • If you stay out of Lech Kril's notice long enough, he will stop tracking you. If you end up behind him, he will try to face you, but will ignore attacking you until you attack him, make a noise, or walk into his cone of vision. If you chose one or both of the first two options, he will slowly waddle around until his cone of vision perfectly lines up with you, where the battle will then continue as normal. He may also waddle around when he "tries" to freeze himself. He will also lose notice if he uses his flame barrier.
  • Rarely, Lech Kril will walk in a random direction and use Fire Wave wherever he is walking. It is unknown if this happens with Ice Wave.
  • When performing a charge attack animation, he will stumble, but won't move accordingly.
  • After chaining him with Harrow's Condemn, Lech Kril will be caught in an endless animation loop.
  • Shooting Lech Kril with the Proboscis Cernos causes him to stagger after the explosion caused by the tendrils, this seems to break Kril's AI or animations and can make his pipes never vulnerable again, making him immortal during phase 1.

Patch History[]

Update 32.3 (2023-02-15)

  • Fixed Lech Kril not taking damage from single target weapons (only AOE weapons could damage the weak spots).
    • In Hotfix 32.2.5 we had made some temporary fixes to prevent the complete inability to defeat these bosses due to the above issue. The above fix reverts the tweaks that were made to how Bosses operate so that they could be defeated over the holiday break. The following issues from these tweaks are now also fixed:
      • Fixed Secondary mechanics that rely on hitting things are not always triggering.
      • Fixed punch-through letting you hit weak points on the opposite side of a target.

Hotfix 32.2.5 (2022-12-14)

  • Fixes towards Lech Kril not taking damage from single target weapons (only AOE weapons could damage the weak spots).
    • There are also some issues with this workaround that will be fixed with the future revert:
      • Secondary mechanics that rely on hitting things are not always triggering.
      • Punch-through lets you hit weak points on the opposite side of a target.

Update 32.1 (2022-11-02)

  • Fixed Capture mission transmissions playing at the start of the Captain Vor and Lieteunant Lech Kril Assassination mission.

Update 30.9 (2021-11-11)

  • Fixed Lech Kril respawning inside the ground if he was pushed off the map with a push ability (Banshee Sonic Boom etc) in his fight alongside Vor.

Update 27.4 (2020-05-01)

  • Fixed Lech Kril not being affected by Viral Status Effects.
    • The same rule of Status Effects reacting with Bosses or VIPS (added in 27.3.0) applies here.

Update 27.2 (2020-03-05)

  • Fixed Lech Kril changing to his Gorgon mid swing if you moved out of Melee range.
  • Fixed Lech Kril and Vor's cinematics not including their weapons.
  • Fixed Lech Kril becoming invincible after he’s cast his Cold abilities at the same time his backpack is destroyed.
  • Fixed Lech Kril’s Brokk disappearing for a moment before doing an overhead Melee ice slam wave attack.

Update 22.8 (2017-12-21)

  • Lech Kril will now prioritize using his ice abilities instead of melee when he can.
  • Upon destroying Lech Kril's backpack, his ice abilities will have their cooldowns reset to reduce time spent waiting around.
  • Changed Lech Kril's Ice Wave ability so that it doesn’t halt the fight when players are meleeing him.
  • Added FX to Lech Kril's weakspot that changes tint based on how much damage his backpack has taken to help make the objective clearer to new player.
  • Very slightly tweaked hitbox location for backpack to try and achieve more consistent damage.

Update 8.0 (2013-05-23)

  • Boss battle revamp.

Update 7.11 (2013-05-17)

  • Added unique voice for Lieutenant Lech Kril.

Last updated: Update 27.2 (2020-03-05)