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Flawed Expel Grineer
Warframe · Mod

Flawed Expel Grineer

Lower-rank faction-specific pistol damage mod

Released Jul 18, 2014

Flawed Expel Grineer gives a pistol a smaller damage bonus against Grineer. Consider it when you need a low-drain faction mod and do not have or do not want to use a standard or Primed variant.

TypePistolPolaritymaduraiMax rank3Base drain2VariantFlawedRarityUncommon
Flawed Expel Grineer GUIDE

Understand Flawed Expel Grineer

Useful when…

  • Fitting a Grineer-specific mod into a pistol build with limited capacity.
  • Using a lower-rank option while deciding whether to invest in a stronger variant.

Effect and fit

The mod increases pistol damage against Grineer: its listed effect is x1.03 at rank 0, x1.08 at rank 2, and x1.1 at its maximum rank of 3. It is a Flawed, standard-slot pistol mod with Madurai polarity and base drain 2. It cannot be equipped with Expel Grineer or Primed Expel Grineer.

Practical use

Use it when Grineer are the intended targets and the lower base drain helps the pistol’s capacity budget. Its faction bonus does not apply to other enemy factions. Accelerated Isotope offers listed Radiation damage and fire rate instead, so it serves a different purpose rather than being a direct faction-mod replacement.

Rank investment

Its maximum rank is 3. The listed example costs are 20 Endo and 966 Credits for rank 0 to 1, 40 Endo and 1,932 Credits for rank 1 to 2, and 80 Endo and 3,864 Credits for rank 2 to 3. The final step reaches x1.1 damage to Grineer. Consider the modest maximum effect against the value of keeping the slot and capacity available for other mods.

wiki.warframe.com ↗

Compare the standard and Primed versions

Expel Grineer lists x1.3 damage to Grineer, maximum rank 5, and base drain 4. Primed Expel Grineer lists x1.55, maximum rank 10, and base drain 4. The Flawed mod’s lower drain can suit a constrained build, while the alternatives list higher faction bonuses; the variants cannot be equipped together.

Limitations and tradeoffs

  • Its maximum listed bonus is x1.1 against Grineer, lower than the standard and Primed versions.
  • It has base drain 2, but that advantage matters only if the faction-specific effect fits the build.
  • It cannot be equipped with the standard or Primed versions.

Common mistakes to avoid

  • Assuming the Grineer bonus applies against other factions.
  • Equipping it alongside Expel Grineer or Primed Expel Grineer.
  • Spending Endo on maximum rank without considering whether the low maximum bonus and faction condition fit the pistol build.

Effects and reference details

Rank effects and investment

RankListed effectsUnpolarized drainTotal Endo from rank 0Total Credits from rank 0
0x1.03 Damage to Grineer200
1x1.05 Damage to Grineer320966
2x1.08 Damage to Grineer4602,898
3x1.1 Damage to Grineer51406,762

These are listed mod effects and fusion costs, not final build damage. Matching and mismatched polarities change capacity. Totals assume starting at rank 0.

References and version

Game data version: Pinned public export

Flawed Expel Grineer — WARFRAME Wiki ↗wiki.warframe.com ↗
Technical source data for verification

These machine-readable game records support the calculations and factual checks. The wiki references above are intended for reading.

Raw game data (JSON) ↗wiki.warframe.com ↗Warframe Public Export ↗

Original data record ↗

Optional: calculate an upgrade or configurationOpen the calculator when you want a cost estimate or a compatibility check.
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Fusion cost and capacity

0Endo
0Credits
2Target slot drain
RankObserved effectDrainEndo from 0Credits from 0
0x1.03 Damage to Grineer200
1x1.05 Damage to Grineer320966
2x1.08 Damage to Grineer4602,898
3x1.1 Damage to Grineer51406,762

Slot polarity changes drain; fusion prices depend on mod rarity and family.

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