The Mod System
The core progression system with interactive demo.
The Mod System is Warframe's defining feature and the engine of all progression. A correctly-modded weapon deals 10–100x more damage than the same weapon with no mods. Understanding this system separates struggling new players from confident veterans.
What Are Mods?
Mods are collectible cards — think of them as upgradeable equipment cards that slot into your Warframe, weapons, and companions. Each mod provides a specific stat bonus or ability modification. They drop from enemies, mission rewards, Nightwave, traders, and other players.
Mods have ranks — each mod can be upgraded using Endo (a resource) and Credits. Upgrading mods is one of your core progression paths.
Important: health and shield mods multiply your base stat — the value your Warframe has after leveling bonuses are applied. For example, Frost has 270 base health at rank 0. At rank 30, his health becomes 370. A max-rank Vitality (+100%) then doubles that to 740 health. The rank-up bonus is applied first, then the mod multiplies the result.
Mod Capacity
Every Warframe and weapon has a Mod Capacity equal to its current rank. A rank 30 Warframe has 30 base capacity — but install an Orokin Reactor(from events, Nightwave, or purchased from Market) and it doubles to 60. For weapons, an Orokin Catalyst doubles weapon capacity to 60.
Each mod has a Drain value — the cost it takes up in your capacity. Vitality (max rank) costs 12 capacity. Steel Fiber (max rank) costs 14. You have 8 mod slots on a Warframe (10 with Exilus and Aura slots counting separately).
Polarity Slots
Mod slots can have a Polarity — a symbol (V for Madurai, D for Vazarin, — for Naramon, etc.). When a mod's polarity matches the slot polarity, the mod's capacity cost is halved. When it mismatches, the cost increases by 25%.
- ◆Madurai (V) — Offensive mods: Ability Strength, damage mods
- ◆Vazarin (D) — Defensive mods: Health, Shield capacity
- ◆Naramon (—) — Utility mods: Duration, Range, Efficiency, Armor
- ◆None (◯) — No polarity: any mod goes here at full cost
You can add polarity slots with Forma — a crafted item that allows you to add or change a polarity at the cost of resetting the item to rank 0 (requiring a re-level). Most serious builds use 2–6 Forma.
Interactive Mod Simulator
Click mods below to see how they change Excalibur's stats in real time. Notice how the capacity bar fills up and how individual stats change — this is exactly how the live game works.
Mod Simulator
Excalibur · Rank 30 · Orokin Reactor · Click a mod to equip
Available Mods — Click to equip / unequip
Excalibur
Rank 30 · Max Stats
Live Stats
How to Get Mods
- ◆Enemy drops. Almost every enemy in Warframe has a chance to drop mods. Common mods drop frequently; Rare mods (gold border) are uncommon. Scan enemies with the Codex Scanner to reveal their full drop tables.
- ◆Mission rewards. Completing missions awards mods from reward tables, especially from Defense, Survival, and Interception missions.
- ◆Nightwave. The rotating challenge system gives Nightwave Creds which can be spent in the Nightwave store for specific mods including hard-to-find Warframe mods and Auras.
- ◆Trading. At MR2+, you can trade mods with other players at a Dojo or Maroo's Bazaar. Use warframe.market to find fair prices for rare mods.
- ◆Transmutation. Combine four unwanted mods to create a new random mod. Rarely worth it compared to direct farming.
Upgrading Mods with Endo
Mods are upgraded (ranked up) in the Upgrade screen using Endo and Credits. Endo is obtained from missions, Arbitrations, and Ayatan Sculptures (ornate collectibles found in missions that can be traded to Maroo for Endo). Prioritize ranking up your most-used mods like Vitality, Serration, and Steel Fiber before spending Endo on situational mods.