In the expansive universe of Warframe, the Spectral Serration mod serves as a powerful enhancement for rifles, functioning as a unique variant of the traditional Serration module. While it boasts an impressive 330% increase in base damage—double that of the standard Serration—it comes with a specific condition: it only activates when the Warframe is invisible. This makes it particularly advantageous for Warframes specializing in stealth or for those utilizing the Helminth Ability Evade provided by the Cyte-09.
How to Acquire Spectral Serration in Warframe

Introduced during the Warframe 1999 update, Spectral Serration has a limited drop pool associated with specific enemies. To effectively farm this mod, you should focus your efforts on the Mischta Ramparts (Hell-Scrub) node located in Hollvania. This location features enemy types that have the potential to drop this elusive mod.
Only two types of enemies in the game will yield the Spectral Serration upon defeat: the Scaldra Dedicants and the Scaldra Eradicators. According to the PC drop tables, the chances of acquiring this mod are relatively low—0.095% from Dedicants and 0.088% from Eradicators. This indicates that players can anticipate obtaining this mod from approximately one in every 1000 kills of these units.
While Scaldra Eradicators are less frequently encountered, Scaldra Dedicants appear more commonly as basic enemy infantry in Scaldra missions. Despite their increased availability, the mod’s low drop probability means that securing it could take significant time. To enhance your chances, consider teaming up with loot-enhancing Warframes such as Nekros, Hydroid, or Khora when tackling the Mischta Ramparts in the Steel Path mode.
If after several hours of grinding you find yourself without luck, purchasing the mod from other players is an alternative. As of now, the typical market price is around 25 Platinum. However, keep in mind that as more players acquire the mod, the price is likely to decline in the future.
The strategic advantage of using Spectral Serration lies in its ability to free up your build for non-base damage Arcanes, ultimately maximizing damage potential for specialized invisibility setups.