From Destinypedia, the Destiny wiki
Crimson Days was a limited time event held in the Tower, coinciding with Valentine's Day. The event was first debuted in 2016, returning for Destiny 2 in 2018. Shaxx serves as the official vendor for Crimson Days in honor of the Crimson Bonds of love and friendship forged between Guardians in the Crucible.
Crimson Days' focus was Crucible mode called Crimson Doubles. Participating in Crimson Doubles allowed players to earn exclusive Crimson Days-themed items.
To participate in Crimson Days, players had to obtain the Quest "Crimson Bonds" from Lord Shaxx; note that players must be level 40. Completing the the quest, which involved completing 7 Crimson Doubles matches in a fireteam, rewarded the Crimson Crest emblem.
Crimson Doubles was a 2v2 Crucible mode where killing one player on the opposing team will cause the surviving player to gain the "Heartbroken" buff to avenge his or her teammate. "Heartbroken" maxed out the affected player's Armor, Recovery, and Agility stats and increased weapon reload speeds; players affected by "Heartbroken" also gained a fiery red aura to mark them. Random rewards from each match included shaders, Ghost shells with a random Defense value above the player's current Ghost Shell up to 320 Defense, and Crimson Candy. In addition, daily bounties were offered by Lord Shaxx which can drop Nightfall-tier rewards.
Crimson Candy was a consumable used to activate a 30-minute buff called "Crimson Connection" among all members of a fireteam. "Crimson Connection" increased experience gains for all of a player's equipped weapons. Only one fireteam member needed to use a Crimson Candy to buff the entire fireteam.
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