In Greek mythology, Lachesis (also Lakhesis, Greek: Λάχεσις, English: "disperser of lots," Etymology: λαγχάνω - to obtain by lot, by fate or by the will of the gods) was the second of the Three Fates, or Moirae. She was the apportioner, deciding how much time for life was to be allowed for each person or being. She measured the thread of life with her rod. She is also said to choose a person's destiny after a thread was measured.
In mythology, it is said that she appears with her sisters within three days of a baby's birth to decide its fate. Her Roman equivalent was Decima. According to Hesiod's Theogony, she and her sisters (Atropos and Clotho) are the daughters of Nyx (Night). In other accounts, they are said to be the daughters of Zeus and Themis as well as several other beings such as Chaos and Ananke.
Lachesis is also mentioned in the tenth book of the Republic of Plato as the daughter of Necessity. She instructs the souls who are about to choose their next life, assign them lots and presents them all of the kinds, human and animal, from which they may choose their next life.
"One of the three Moirae sisters of fate in Greek Mythology. She is the apportioner, measuring the thread which determines the life span of a person."
—Shin Megami Tensei III: Nocturne compendium
Lachesis and her sisters are the bodyguards of Hikawa, after Ose is defeated by the Demi-fiend. They appear in the Obelisk, setting traps to impede the movements of the Demi-fiend, one of which involves figuring out the sisters' purpose in the cycle of life and defeating the Moirae in that order.
Lachesis acts as one of the three bosses of Nakano's silver-level Stone Site instance. By obtaining the Red Thread of Fate from the endchest, players are able to obtain her plug-in by speaking with the Suspicious Looking Man? NPC. She is a special double-fusion of Lamia and Ocypete.
Lachesis appears in the Tennozu Shelter with her sister, Clotho and Atropos. She can teach the Makajam, Rakukaja and Concentrate skills through her Demon Whisper. Lachesis benefits from learning ailment, support and Electricity skills.
"The middle sister of the three Moirae Sisters of Greek legend. She is the apportioner, measuring the thread which determines each person's lifespan."
—Persona 5 background
Lachesis is a Persona of the Fortune Arcana. Caroline and Justine request that the protagonist create Lachesis with the Tetraja skill as part of the StrengthConfidant. A simple method of completing this request is to acquire the Clotho Persona and level her up until she learns Tetraja at Lv.27, then fuse Clotho with Regent in order to create a Lachesis with the Tetraja skill.