Reaper Pheromone Gland

A gland from the Reaper Queen

A wild Reaper Queen that is killed leaves Reaper Pheromone Glands in its inventory, an Aberration item listed for ARK: Survival Evolved and ARK: Survival Ascended. Its description hints that it has a purpose: "Secretion gland extracted from a Reaper Queen. Perhaps it has some use..." The ARK Wiki lists it on Aberration and Genesis: Part 2; our records also list Lost Colony and Valguero.

Gathering the glands

Open the inventory of the dead queen to take them; each kill gives a random amount of 4 to 5 glands. Our records list one loot source, the Reaper Queen. A gland weighs 0.01, and a full stack of 100 weighs 1.

Summoning the Aberration boss

According to the ARK Wiki, the gland serves for summoning the Aberration Boss. Our records count 2 recipes, the same in both games: the Generate Aberration (Alpha) Portal takes 7 glands, and the Generate Aberration (Beta) Portal takes 2.

The Pheromone buff and baby Reapers

Players and creatures can also consume a gland for the Pheromone buff, which lasts 300 seconds and stacks with each extra gland. While it is active, a baby Reaper King does not target or damage the one who consumed it, except when the baby is already locked onto something close by, or is carried on the survivor's shoulder. Until they reach the juvenile stage, baby Reapers cannot be controlled at all and attack anyone who lacks the buff. The ARK Wiki adds that a consumed gland gives off a particle effect identical to that of Bug Repellant, and that before version 278 it was mandatory for imprinting a Reaper King baby.