Operation Crimson Hammer

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Operation Crimson Hammer
Gate-Operation Crimson Hammer.png
Gate Icon-Gremlin.png Gate Icon-Construct.png Icon status fire.png
Gate-Operation Crimson Hammer.png Storming the Walls

Gate-Operation Crimson Hammer.png Silence the Guns

Gate-Operation Crimson Hammer.png Flank the Frontlines

Gate-Operation Crimson Hammer.png Clear the Gatehouse

Gate-Operation Crimson Hammer.png Engines of War

Gate-Operation Crimson Hammer.png Aftermath

Operation Crimson Hammer is an Expansion Mission that can be unlocked with a purchase of the expansion mission for $5.95. Challenge the mighty Warmaster Seerus in his terrifying Grand Arsenal and unlock unique mission rewards: the powerful Rocket Hammer and the shadowy Dark Retribution bomb!

It was introduced to the game in the 2012-02-29 release. One of the Knights on the account must have completed the Rank Mission 3-2 'The Pioneers' in order to be eligible for expansion missions.

Once eligible, select the Expansion Mission you wish to purchase from the Expansion Mission menu and select 'Purchase Expansion'. Steam users will be taken to Steam and Web users to the Energy Depot to complete their purchase.

Purchasing an Expansion Mission unlocks it for all knights on the account.


Warmaster Seerus is the evil master of munitions within the gremlins' all-powerful Crimson Order. Thought to be the true mastermind behind the Roarmulus Twins and countless other gremlin weapons, he is the Crimson Order’s creator and supplier for their diabolical engines of war.

Recon Knights under the command of Lieutenant Feron recently discovered Seerus’s ‘Grand Arsenal,’ his development center and storage facility for all his weaponry. Now, Feron himself has lead several squads of knights directly into the Grand Arsenal, with the intention of weeding out Seerus and destroying his war machines.

Met with heavy resistance, Feron’s squads require reinforcements and Spiral HQ sends several knights to aid them in their assault.


Three new item series were added as part of Operation Crimson Hammer:

1. Obtained as a mission reward, this sword class weapon launches your forward with its combo and creates a doubly devastating blast when charged:

2. Obtained as a mission reward, this shadowy bomb creates a swirling storm of projectiles after exploding:

3.Obtained as a bonus, craftable item, this gunslinger's mask can be created if you survive enough battles against the Warmaster himself! Talk to Vise in the mission lobby for details:

Expansion Mission rewards cannot be sold, traded or dropped.


Storming the Walls


Silence the Guns


Flank the Frontlines


Clear the Gatehouse


Engines of War




  • None *

* There might be corpses of Gremlins and destroyed Battlepods, but they aren't counted.

Aftermath is a Treasure Floor; there are no active monsters, and loadouts may be changed anywhere, so heat from the treasure boxes here can be applied to any equipment in a knight's arsenal.


  • * Note that in addition to the regular tier's Gremlin Thwackers and Gun Puppies, picking up the bonus key in the level after clearing the shadow fire blocks will cause 2 Gun Puppies and a Gremlin Thwacker one tier higher than the current to spawn. Therefore an Ironclaw Thwacker will spawn in Tier 1, and a Darkfang Thwacker in Tier 2. Tier 3 is unaffected.
  • ** In the arena, the Tier 2 version of these monsters appear in Tier 1. In Tier 2 and 3 alike, the Tier 3 version appears, and has a fire status variant, namely the Red Rover, Firo Knight, Hotrode, and Redward.
  • Almost all Gremlin Mortafires are replaced by Blazing Mortafires in Tier 2 and Tier 3.
  • All Battlepods of Operation Crimson Hammer can cause fire status in all Tiers.


Video Compendium

Spiral Knights - Operation Crimson Hammer

Historical Notes

  • A new level, increase in Warmaster Seerus' health and a number of bugfixes were added on release 2012-03-07.
  • As of release 2013-09-25, Operation Crimson Hammer can also be purchased for 3,200 energy from the mission interface.

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