H11-4: Operation Achlys-4

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Operation Achlys-4
Episode 11
Previous H11-3
H11-4 map.png
The will in these ruins is still not fallen–shall not be surmounted–cannot be exhausted–will do nothing but last forever.
<Twigs That Crave> Produces Rot Eaters when destroyed or at the end of the stage.
<Allerdale's Guard> Forms an AOE shield for allies.
Abilities of "The Last Steam Knight":
[Pneumatic Pressurization] reduces damage taken while active, and no longer Stuns after ending; [Unto My Last Breath] seals off all unitless tiles within range once it locks onto targets.


Recommended level
Sanity Drill Plan EXP LMD
10 1 100 (120) 100 (120)
Unit Limit Initial DP Life Points Enemies
9 16 3 38
Deployable devices Allerdale's Guard ×3
Static devices Twigs That Crave ×4
Terrain properties When The Last Steam Knight's Unto My Last Breath barrage starts, any unoccupied tiles in the target area(s) will be sealed by orange cross symbols and becomes undeployable for the rest of the operation.
The damage dealt by Corruption is increased by 100%.


First clear
3 Stars
Originite Prime


Normal Sarkaz Witherer Captain ×12
Elite Rot Eater, Rampaging Rotchaser ×13, Sarkaz Wither Maw ×5, Advanced Sarkaz Wither Tank ×7
Boss "The Last Steam Knight"
  • All enemies (including The Last Steam Knight) have their HP, ATK, and DEF increased by 20%.
  • The Last Steam Knight takes −30% Physical and Arts damage while his Pneumatic Pressurization is active (and by extension, throughout the second phase), and is no longer Stunned when it expires.
    • In the second phase, Pneumatic Pressurization also increases The Last Steam Knight's speed by 50%.
  • Rot Eaters are spawned from Twigs That Crave and excluded from the enemy counter.