Nightmare Mode

Nightmare Mode is an optional difficulty modifier introduced in. When Nightmare Mode is selected, up to two mission modifiers take effect that greatly increase the mission's difficulty, but completing the mission will reward players with Nightmare Mods, which positively affect two stats of a weapon, Warframe, or Companion.

To unlock Nightmare mode on a given planet, one must complete all mission nodes on that planet (barring Dark Sectors).

Mechanics
When Nightmare Mode is unlocked on a given planet (unlock all other nodes on said planet), the game randomly selects one mission node for Nightmare Mode every 8 hours, limiting the possible Nightmare missions (and thus, potential rewards) to 17 missions every 8 hours. After completing the Nightmare Mode mission for a given planet, a new mission node will be selected 8 hours after completion.

Mission nodes under the effects of Nightmare Mode have a scarlet background and a white swirl in lieu of a Faction icon. Mission modifiers will also be listed next to the mission type. From  onwards you may choose whether to run the mission in Nightmare Mode or not. If some of the players in a given squad do not have Nightmare Mode unlocked, only those with it unlocked should initiate the mission vote or else the mission will start normally.

Nightmare Alerts
Additionally, random Nightmare Alerts may appear, independently of the mission completion requirement. These special Alert Missions guarantee a specific Nightmare Mod upon completing the mission. In exchange, the No Shields modifier is always among the selected modifiers.

Challenges
All enemies encountered in Nightmare Mode have significantly increased levels, as well as massively increased damage and enemy spawns compared to their standard levels. Ciphers may not be used during Hacking and any summoned allied Specter will immediately be hostile to all players (except Shockwave MOAs spawned from a MOA Cabinet Spawner). Environmental Hazards can also appear as usual.

Up to two of the following challenges may occur per mission, and each modifier has an equal chance of being selected.

Retired Challenges
The following challenges were present in earlier builds of the game, but have since been removed.

Mission Rewards
Below are the possible Nightmare Mode Mods that can be rewarded upon completing a Nightmare Mode mission. These mods are grouped into tiers based on the Nightmare mission's overall difficulty: