Psi Sword
Psi Sword
Weapon Data
First Found on Engineering (CM Unlocked)
Requirements 4th Tier Neural Capacity
CEE Psi Power
Psi Amp
Researchable No
Attack Types Normal
Overhand [with Smasher]
Damage 18 (Normal)
24 (Overhand) [with Smasher]
Summon Code psisword


Psi Power menu icon

Cerebro-Energetic Extension or Psi Weapon is a Tier Four offensive Psionic Power in System Shock 2.


This Power temporarily replaces Psi Amp with a melee Weapon of Psionic energy. Its duration depends on the player's PSI and equals PSI × 10 seconds. Overloading this Power does not affect it in any way!

Duration Table

PSI Level Duration
1 10 seconds
2 20 seconds
3 30 seconds
4 40 seconds
5 50 seconds
6 1 minute
7 1 minute 10 seconds
8 1 minute 20 seconds

Damage Table

Annelid Half-Annelid Mech Half-Mech Final Boss
Standard x1 x1 x1 x1 x1


General Melee Strategies

  • Strength increases the final bonus added to the melee damage, and thus should be a high priority.
  • Both Lethal Weapon and Smasher O/S Upgrades (acquired preferably in that order) substantially increase the damage output of a melee weapon, and should come in handy throughout the whole game.
  • Contrary to popular belief, O.S.A. Agent is arguably the best class to specialize in any melee weapon, as one can unlock the following Psionic Powers at the (very) beginning:
  • Observe the attack patterns of enemies and always try to evade when they are about to strike. Agility can make the job easier for obvious reasons.
  • Shotgun Hybrids are one of the tougher opponents on early stages, as they have hitscan weapons. It is hard to defeat them without taking any damage being already in their range. However, the player can hide, attack them from behind and circle-strafe, buying enough time to finish them before they turn and start shooting.
  • Protocol Droids are very hard (close to impossible, actually) to defeat with melee weapons safely, therefore keeping a ranged weapon in one's inventory is advised.
    • The other approach is to run away at just the right moment when they go into self-destruct to avoid the explosion. Going around corners is very useful. Lots of practice and high Agility are recommended.
  • Enemies with no melee attack at all, including most droids, always prioritize getting some distance before attacking. That means as long as one stays very close to the enemy, it will keep walking back instead of attacking the player, giving enough time to defeat the foe. This strategy stops working efficiently when an enemy does not have enough space to flee.
    • This strategy also applies to Cyborg Assassins, but they can fall back at a very high speed, putting the player in a tough situation.
    • All Robots have their only weapon mounted on their right side, the other one being harmless. Approach them preferably from their left side using the above strategy to avoid their attacks.
      • If they follow you, make sure to go clockwise. They can shoot at you even if only a part of their weapon protrudes around the corner.
  • Turrets are best attacked at close quarters - that is, if they can be reached. Cutting the distance and circle-strafing around them doesn't give them a chance to fire at you.

Psi Sword Specific

  • This Power can be unlocked as soon as on Engineering Deck (at its beginning on Easy difficulty ; at its very end on Impossible). If you're playing a pure melee character, you might as well focus only on this Power. While the Crystal Shard is better, it needs roughly 2.4× Cybernetic Modules to be Researched and maximized - yet still it deals similar damage to half-Mechs and cannot deal any to SHODAN. Laser Rapier, on the other hand, only excels when fighting pure Mechanical foes.
    • The biggest drawback of the Psi Sword is the limited time of availability. You have to recast the Power each 1:20 at best, thus it's good for short, intensive fights, but not for regular exploring. Keep a Wrench or some other weapon handy for those.
  • The Weapon's damage cannot be upgraded, no matter the PSI level. All other bonuses apply, however.
  • While its range seems the biggest, it's actually the shortest, though Wrench's is only a tiny bit longer.
  • Psi Powers cannot be cast while the Psi Sword is active (even if they can be pre-selected). Changing weapon or unequipping the Psi Amp cancels the Power.
    • It also stops working in case of saving-and-loading, leaving the current map using e.g. a Bulkhead or dying.

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