Chibi-Lymantria

A Turkey Trial chibi

Chibi-Lymantria, a small cosmetic pet, entered ARK: Survival Evolved with Turkey Trial 6; the ARK Wiki says every event since has offered it, and our records carry it for ARK: Survival Ascended as well. The game describes it like this: "Earn XP from Alpha creature kills when equipped, to increase its level and earn additional max-levels for your Survivor!"

How it raises a survivor's maximum level

Equip it (the off-hand slot in ASE, the dedicated chibi slot in ASA) and kill qualifying creatures: the pet levels up as many as five times. Each of those levels permanently grants 1 more maximum level to whichever survivor has it equipped when it levels, up to 5 extra levels in all.

Qualifying kills on the wiki's list include the Alpha Basilisk, Alpha Deathworm, Alpha Leedsichthys, Alpha Tusoteuthis, Alpha Mosasaur and the Enraged Corrupted Triceratops. The Steam version of ASE adds the Alpha Chrysaora and Alpha Tridacna among others, and ASA adds the Alpha Hulking Revenant, Alpha Palaeoctopus, the Enraged Lightning Rex and Astral creatures such as the Astral Mammoth.

How it follows you

The pet stands to the survivor's front-left and copies their movement and facing. Mounted, the survivor carries it in their lap; in a Tek Sleeping Pod it still follows along but faces up at the survivor's right.

Death, weight and loot

It counts as an ordinary item, not an unlocked skin: it drops with the inventory on death and is lost if the death cache is never retrieved. The wiki notes one exception among chibis, the Chibi-Noglin from the Genesis Season Pass, which comes back new and unleveled after respawn. The Chibi-Lymantria weighs 0 and has a stack size of 1. 2 loot sources can contain it: Fishing Items (Valentine's) and Fishing Meat (Valentine's). The wiki dates it to patch 354.4.