Amprex

The Amprex rifle fires a continuous beam of high voltage electricity that arcs among nearby enemies. This weapon excels at crowd control.

The Amprex is a Corpus beam rifle that fires a continuous stream of Electricity arcs that can chain between units, making it a devastating crowd control weapon.

Characteristics[edit | edit source]

This weapon deals Electricity damage.

Advantages:

Innate Electricity damage – effective against Machinery and Robotics.
Second highest critical chance of all continuous and automatic primaries, behind Synapse.
Above average critical multiplier.
High status chance.
Heavy Caliber's accuracy penalty is minimal on this weapon.
Beam can chain up to 3 nearby enemies within 10 meters from the initial target.
- Enemy corpses will still allow the beam to connect to nearby enemies.
Consumes 0.5 ammo per tick of damage.

Disadvantages:

Innate Electricity damage – less effective against Alloy Armor.
- Damage cannot be increased with Slash, Impact or Puncture mods.
Damage ramps up from 30% to 100% over 0.6 seconds when firing. After firing stops for 0.8 seconds, the damage decays back to 30% over 2 seconds.
Slow reload speed.
Main beam has a limited range of 18 meters.
Chain beam has a limited range of 10 meters.
- Chain beam range cannot be increased with Sinister Reach.

Acquisition[edit | edit source]

The Amprex's blueprint can be researched from the Energy Lab in the dojo.

Manufacturing Requirements
25,000	8	600	9,000	3	Time: 24 hrs
25,000	8	600	9,000	3	Rush: 35
Market Price: 225			Blueprints Price:50,000
Energy Lab Research 3,000
7,500	15	350	750	350	Time: 72 hrs
7,500	15	350	750	350	Prereq: Dera
x1 x3 x10 x30 x100

This weapon can be sold for 7,500‍7,500.

Notes[edit | edit source]

When fired at an enemy, the beam will chain to the closest enemy within 10 meters of the initial target. From there it will chain again, up to a maximum of 3 chains in total. A chain will do 0.5^n(n+1)/2 times the main beam's damage, where n is the chain number. Any enemy caught in the width of the beam will also be damaged.
- Headshotting the original target does not affect the chain damage.
- The beam will not chain to a Nullifier through its shield should it connect with a target outside or partially enclosed by it.
- The beam can also continue to chain to enemies even if targeting a dead enemy or an enemy who is dead but in a dying animation.
- Additional electrical arcs are also emitted, striking randomly around the player. However, these stray arcs are purely visual in effect.
Compared to the Synapse, the Amprex deals more damage and it continuously arcs to other enemies, making it more effective against crowds. Use the Synapse for single targets and the Amprex for crowd control.
- The fire rate of Amprex is the same as Synapse, and it deals slightly more damage, however it has a 2.6s reload speed, nearly double the 1.5s reload speed of the Synapse.

Tips[edit | edit source]

This weapon's high critical chance and damage make it ideal for critical focused builds using Point Strike and Vital Sense.
The Amprex's high fire rate and its low base damage make it highly ammo inefficient, consuming ammo at an alarming rate. It is recommended to use Rifle Ammo Mutation, Carrier's Ammo Case, or Rifle Scavenger to ensure a steady supply of ammo. Alternatively, bring Squad Ammo Restores to help replenish lost ammo.
Alloy Armor is highly resistant to electricity damage. To counteract this, consider pairing it with Heat or Toxin damage to respectively create Radiation or Corrosive damage.
Critical Delay can be used to reduce ammo consumption, increase time between reloads, and increase damage per hit, but at a cost to the weapon's DPS.
Although it is preferred to mod the weapon to other damage types, base Electricity damage paired with its high status chance makes for a good stunning weapon among groups, and the added damage through electrical procs that chain to other enemies. Infested have no weakness or resistance to electrical damage, making the base electrical damage work well for that faction. Forma is often required to change the damage type to match the amount of damage done by pure electrical damage, however.
Using with Mirage gives you two more beams that also chain to other targets, providing much more crowd control.
Decreasing the accuracy of the Amprex with a mod like Heavy Caliber will not only increase the Amprex's damage but works well for large groups of enemies as it increases the spread of the weapons Fire.

Trivia[edit | edit source]

After the clan obtains the Energy Lab, it will take exactly 12 days to research this weapon.
The Amprex's name is a portmanteau of the words Ampere (the base unit of the International System of Units used to quantify electric current) and the word Rex, which is the Latin word for king.
- The word ampere itself is named after a French mathematician and physicist, André-Marie Ampère, who's also considered to be one of the fathers of classical electromagnetism, most commonly known for Ampère's Circuital Law.
- Like the Flux Rifle and Detron, Amprex does not conform to the common Corpus weapon name scheme; two syllables ending in 'a'.
The weapon shares its similarities on its battery components with Tetra.
This is the third Primary weapon that deals purely Electricity damage, after the Lanka, and Synapse.
This is the second clan weapon that does not need a Forma in its construction.
Hatches on the side of the Amprex slowly open up during firing, spreading vanes underneath. This animation is a visual indicator of the weapon's magazine capacity, with the vanes spreading out more the closer the magazine is to empty. The hatch closes upon reloading.
This is the first weapon in Energy Lab whose duplication costs 50,000 credits.
After Update 15.13, the chained beams were changed to be affected by Sinister Reach as well. As of Update 22.14, this is no longer the case.

Media[edit | edit source]

Amprex in Codex
Demonstration of Amprex color customization
Frost standing at the end of the Amprex's beam length. Took approximately 4.5 forward rolls to reach him from this distance.
Amprex in Arsenal
Amprex side profile

Tenno Reinforcements - Amprex

Warframe - All Corpus Primaries - Weapon Animations & Sounds (2012 - 2019)

Warframe - All Corpus Weapon Reloads in 1 minute (2012 - 2019)

Amprex Skins Edit

Patch History[edit | edit source]

Update 22.14

Fixed Beam weapons not being able to damage enemies (alive but in a ragdolled state) when being affected by certain ‘crowd control’ Abilities.
Damage now ramps up over 0.6 seconds and after moving off target there is a delay of 0.8 seconds before it starts to decay over 2 seconds.
All Beam weapons now start their Damage ramp up at 20% (instead of 10%).
The Multishot chance should now apply more consistently with Beam weapons.
Weapon Range Mods (like Sinister Reach) no longer affect the distance of chains for chainable Beam weapons (like the Amprex). Main Beam distance is still affected by them.
Fixed Beam weapons continuously firing when quick Meleeing.
Chain Range increased from 7.5m to 10m.
Damage reduced from 24 to 22.

Hotfix 22.13.4

Increased the Beam weapon Damage ramp up time from 0.8 to 1 second.
Fixed Beam weapon Damage ramp up not happening per target.

Hotfix 22.13.3

Perfect accuracy and high fire rate is balanced by limited range and damage ramping up from 10% to 100% over 0.8 seconds when firing and decays back to 10% over 1 second after stopping.
Mastery Rank increased from 5 to 10.
Damage increased from 7.5 to 24 .
Fire Rate decreased from 20 to 12 .
Status chance changed from 20% per sec to 22% per tick of damage.
Critical chance decreased from 50% to 32%.
Critical Damage increased from 2.0x to 2.2x.
Max ammo capacity increased from 540 to 700.
0.5 Ammo consumption per tick of damage.
Aimed Zoom reduced from 2.23x to 1.4x.

Update 19.5