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The Thirster is a boss enemy in the Stationary Security Service game mode of Arknights. It is the main boss of The Abandoned Lighthouse.

Enemy description
It once bore an Iberian name, until it tossed that name into the sea and disappeared into the abyss. However, embracing the seawater was not enough to moisten its parched throat, and the clear red liquid flowing within its veins is equally enticing, so it has returned to dry land once more, thirstier than ever.


An Iberian of unknown background who transformed into a malformed, bloodthirsty Sea Terror which explains the disappearance of people visiting the abandoned lighthouse, the Thirster has very high HP and DEF, and most notably, a titanic 95(!) RES that makes it very difficult to take down especially with Arts damage, although its ATK is lower in turn. In addition, it has multiple abilities that can debilitate an entire squad, but can be counteracted with strong healing power.

  • The Thirster's attacks inflict Nervous Impairment equal to 50% of its ATK.
  • Every 40 seconds, the Thirster will add an Absorber into the Deployment Waiting Zone and, after 3 seconds, fires filthy debris at two friendly units anywhere on the map, dealing Arts damage and Nervous Impairment equal to 100% and 50% of its ATK, respectively. The filth attack will target three units from Danger Level 12 and four from Danger Level 15.
  • Whenever a deployed Absorber despawns once fully healed, the Thirster has its DEF and RES permanently reduced by 100 and 5, respectively.
  • Whenever the Thirster loses 15% of its maximum HP, it will Stun three friendly units on the map for 8 seconds, stop moving, and protect itself with a barrier that absorbs damage equal to its missing HP and lasts for 20 seconds; if the barrier is not destroyed within said timeframe, all friendly units will receive 1000 Nervous Impairment — enough to instantly cause it to explode without Elemental Damage reductions.
    • The amount of Stunned friendlies when the barrier is created will be increased by 1 in each subsequent activation of this ability, capped at six, and will be reset whenever the barrier is destroyed.


Stationary Security Service Receding Tides


HPATKDEFRESMov. speedAttack itvl.E-RESERST
0.2 tiles/sec.
2.7 sec.
Weight 5
Life Point penalty 2


Silence Stun Sleep Freeze Levitate Tremble
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