The possible rewards from this event's mission were Corrosive Projection, Shield Disruption, and Infested Impedance. The missions were defense missions, which could've been against any of the three factions and had a variable number of waves that needed to be survived in order to complete the mission.
Very similar to the Fusion MOA Event in which a global operation is held requesting all Tenno to attack a brand new enemy. The event rewarded all participating players with the Snipetron Blueprint, a weapon which was removed in the past due to it not following Corpus lore, along with the Snipetron Vandal so long as the player had at least 20 Informer kills.
Required Tenno to attack the Infested to obtain Corruptors. These Corruptors were then used to taint the fuel cells of large Fomorian ships of the Grineer as a Mobile Defense type mission. Tenno had to attack and destroy one Fomorian ship for each planet and success rewarded them with new Ammo Mutation mods, 2-5 dependent on how many points were obtained by the player. alongside this all contributing Tenno also received a holographic badge.
The first event to last more than 72 hours. Tenno were to take part in special replayable alerts which rewarded them with Corpus Datamass and Corpus Cipher which were used as components to create Corpus Void Key. These void keys would take players to a special Corpus void mission where they would capture special Scout enemies from 3 ships, each gaining new abilities with each ship to make them harder to capture. Succession of the event rewarded Tenno with access to the Grineer Settlement tileset along with 3 dual-stat mods (Shred, Vigor, Lethal Torrent) dependent on how many points were obtained per player (1, 50, 100 points respectively) and also a second holographic badge to commemorate the participation in this event.
An event focused on special Exterminate missions in locations on Mars that the Grineer and Corpus were competing for control of. Tenno chose to assist a faction of their choice in defeating the other, with special rewards offered by the victorious faction for helping them achieve victory.
An event that was introduced in Update 11.0. It lasted until the infestation had been cleared. The missions type was extermination against infested, and the hunt was to make Alad V reveal his position on Jupiter.
An event that was held from December 19, 2013 to January 6, 2014. The Grineer set out to poison the great overgrown forests of Earth. Players were tasked with scanning Earth's flora for ingredients and then creating and injecting antitoxins into the poison-spreading machines. Introduced the Earth jungle tileset.
An event released with Update 13.8. It requires players to sabotage the Infested Ship by destroying 3 Infested Hives per ship, with each destroyed hive having various consequences for its destruction, such as increased Infested retaliation. This event was the debut of the Hive Sabotage game mode.
This event was the introduction of the Excavation mission type replacing Survival missions on planets. What players had to do was gain 500 points on Earth to obtain access to Phobos and a badge, then gain 1000 points on Phobos to get the Cryotic Mod Pack and obtain access to Europa, where a new Tile Set was introduced. 3000 points earned players the Latron Wraith and the Polar Glaxion Skin.
Released with Update 15.8, this event had Councilor Vay Hek attempt to destroy the newly constructed Tenno Relays, using his fleet of Balor Fomorian ships. In order to stop him, you had to collect Omega Isotopes to build a Fomorian Disruptor that would allow you to take your Archwing into the core of a Balor Fomorian, and destroy it from the inside out. Each core destroyed earned you a point towards a new reward, which included: An Eyes of Blight emblem, an Archwing Mod pack, and the grand prize, the Imperator Vandal. While you may have completed a mission, if a certain number of people did not, Councilor Vay Hek would end up destroying a Relay, and moving on to the next.