The Tysis pistol spits out caustic darts that corrode their victims from within.

The Tysis is an Infested sidearm that fires Corrosive b Corrosive bolts, which are capable of wearing down heavy armor easily.

Manufacturing Requirements
Time: 24 hrs
Rush: Platinum64 40
MarketIcon Market Price: Platinum64120 Blueprint2 Blueprints Price: Credits6430,000


This weapon deals Corrosive b Corrosive damage.



  • Innate Corrosive b Corrosive damage - less effective against Proto Shields.
  • Cannot deal Slash b Slash, Impact b Impact, and Puncture b Puncture damage; does not benefit from mods that increase these damage types.
  • Projectiles have a travel time, requiring the user to lead their shots.
  • Extremely low critical chance.
  • Below average critical damage multiplier.
  • Relatively low fire rate.

Weapon LoadoutsEdit


  • Tysis needles retain their course after piercing their first target, possibly penetrating multiple targets without losing accuracy.
  • Tysis needles will be invisible if energy color is Black, making target leading harder as you can't estimate travel speed and deviation.


  • A status chance of 182.50% may be obtained by combining Stunning Speed, Sure Shot, Jolt, Pistol Pestilence, Scorch, and Frostbite. However, there is no benefit to a status chance above 100%.
  • With its high status chance, the Tysis may be used as a softening weapon against Grineer. Corrosive effects stack, allowing another weapon to easily deliver the killing blow.
    • It is recommended to mod the Tysis for Radiation b Radiation damage when dealing with Grineer, allowing it to deal extra damage to NapalmsBombards and Elite troops.
  • Adding Blast b Blast damage makes this weapon ideal for tackling Infested Ancients, as Fossilized enemies take more damage from both elements.


  • The Tysis' needles may stretch targets if they are already pinned to the wall by another weapon's projectile (like the Boltor).
  • This is the second Infested weapon available on the Market. The first was the Mire.
    • The Tysis is the first Infested sidearm to be non-clan exclusive.
  • The Tysis may derive its name from the suffix "-ptysis", which typically refers to spitting out substances (e.g. Hemoptysis would refer to spitting blood).
  • The head of the Tysis vaguely resembles the head of a Goblin shark.


  • In the Codex
  • Tysis With Infested Color Pack
  • Tysis in the Arsenal
  • Tysis

Update HistoryEdit

Update 22.12
  • Mastery Rank increased from 4 to 9
  • Damage increased from 35 to 79
  • Critical chance increased from 2.5% to 3%
  • Improved Projectile trail FX
  • Mag size decreased from 15 to 11
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