Rock Drake Egg

Two names for one egg

In ARK: Survival Ascended this item is listed as Rock Drake Egg (Unfertilized), with the plain description "Unfertilized Rock Drake egg. Food." In ARK: Survival Evolved it is simply the Rock Drake Egg, and its ASE text praises it as tremendously nourishing and of extraordinary value in cooking recipes. Both rows tie it to Aberration, and the ARK Wiki adds that it later reached Fjordur too.

Eating it and turning it into kibble

The egg can be eaten, and the wiki names Extraordinary Kibble as the kibble made from it; earlier the recipe was Kibble (Rock Drake Egg). That kibble is the specific taming food for creatures such as the Griffin, Yutyrannus, Thylacoleo, Megalania and Rock Elemental, and anything that eats Basic, Simple, Regular, Superior or Exceptional Kibble takes it too. The wiki also calls the egg a main taming food for the Basilisk.

Raiding the nests on Aberration

The ARK Wiki says Rock Drakes drop these eggs at random, and on Aberration it places the nests below Element Falls, in The Grave of the Lost, behind a twin waterfall in an area lit yellow. Some of the hollows along the walls hold a nest. Taking an egg turns nearby wild Rock Drakes hostile, and their tight turns and gliding make the escape dangerous. The area is irradiated, so the wiki advises a full Hazard Suit, plus a charge light source such as Lantern Pets for the Nameless packs that can appear there.

Per the wiki, a tamed Rock Drake is the easiest way to get one: it glides off the nest, climbs around the falls and is immune to the radiation, though wild drakes still go after it once an egg is taken, even camouflaged. Spinos and Megalosaurus resist the radiation as well and can fight off the drakes if their level is high enough, while a fast mount such as a Roll Rat or Ravager, fed Mushroom Brew, can outrun them.

Hatching, weight and spoilage

An egg that comes from two mated Rock Drakes can hatch into a baby, and the wiki lists a Fertilized Rock Drake Egg as a variant. For hatching it gives an incubation time of 6h 14m 58.201s at -90 to -80 °C, and at the ideal temperature an Egg Incubator can shorten that by up to 20%. A female needs 18h to 2d before she can lay again. Each egg weighs 50 and they stack to 100, for 5000 in a full stack. The spoil time is 691200 seconds, which is 192 hours or 8 days.