Upwell Structures Vulnerability States


Structures can only be attacked at certain times and this article covers the possible states a structure can be in, and what that means.

Structure States


This state indicates the structure may be attacked and can take damage. This state happens in several circumstances.

  • Just after a structure has been anchored
    • After the 24 hour anchoring period the structure will be vulnerable for 15 minutes
    • If the structure is not attacked during those 15 minutes, its shields and armor are repaired to 100%

  • Naturally occurs every week through the vulnerability window
    • Number of vulnerable hours varies depending on the structure type and size
    • Players owning the structure set the vulnerable hours themselves (if they have the appropriate corporation roles)


  • Structures cannot be attacked in High Security space without a war declaration
  • If the vulnerability timer of a Structure naturally expires, the structure returns to an Invulnerable state until the next vulnerability window occurs

How many hours of vulnerability time have to be set depends on the Citadel:

Vulnerability hours
per week
M Astrahus 3
L Fortizar 6
XL Keepstar 21
XL Upwell Palantine Keepstar 21



This state indicates the structure cannot be attacked. This happens in several circumstances:

  • When a vulnerability timer naturally expires
    • At this point, all shields, armor and hull layers are restored to 100%

  • When an attack succeeds
    • This happens when the attackers bring shields or armor hitpoints to 0 
    • At this point, the structure becomes invulnerable for a specific amount of time before having its next layer vulnerable to attack (if shields were taken out, armor is now vulnerable. If armor was taken out, hull is now vulnerable)


There are side-effects on the Structure operation if an attack is successful, e.g. If the armor layer is taken down, this shuts down structure services

The duration  of the Invulnerable state between attacks is:

  • 24 hours from shield to armor, then 6 days from armor to hull for any structure outside wormhole space

  • 24 hours from shield to armor, then another 24 hours from armor to hull for structures inside wormhole space


This state actively indicates the structure is under attack

This happens when any kind of damage is applied to a vulnerable shield, armor or hull layer. 

NOTE: Incoming damage is limited to a specific amount per second and depends on the size and type of structure

This state lasts for a specific amount of time

  • The repairing window is shorter than the vulnerability window
  • Time is paused whenever damage is dealt
  • Immediately ends if the vulnerable layer (shields, armor or hull) reaches 0 HP. In case of shields or armor, the structures goes back into an invulnerable state, before having the next layer set to vulnerable. In case of hull, the structure is immediately destroyed
  • If the repair timer naturally elapses, the structure goes back into vulnerability - if that timer elapses too, the structure fully recovers from the attack. Its shields, armor and hull are restored to full values


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