Greetings to all the wandering souls in this guide. Let me bring you up to speed: right now, we're dissecting the topic of obtaining hidden achievements, specifically the "Plump Evolution Theory". For an introduction to the guide, I invite you to read the instructions below.

"Plump Evolution Theory": Where to Find Blubberbeast

"Blubberbeast" - it's such a cute name, given to the tamed plump creature you'll be interacting with very soon. The joint future is easily discerned from the achievement's name - accompanying the floating cutie in its journey to maturity. You can observe the initial location of the pet on the map in the photo below.

You will be greeted by a gazebo - to the universal sigh of disappointment, it's locked. Take a breath, the solution to another puzzle is simple. Use Anemo on the three lanterns in a specific order. First, activate the one farthest from the structure (on the stone path), then the one to the right of the entrance, and finally the one on the left. Voilà, please enter. By the way, a generous chest awaits outside, and a precious one inside (+ an Oculus).

Enter and head to the illuminated notes that tell the backstory of the plump creature. You can interact with the creature itself in the aquarium. ...And the creature is in a very questionable state, I must say, upside down, which is sort of an indicator of the baby's condition - additionally indicated by a well-being counter. And this is where the caring process begins.

"Plump Evolution Theory": How to Care for Blubberbeast

The cooldown for activity is non-standard. If you want to speedrun the achievement, you'll be visiting (witnessed by conscience) Blubberbeast with a 7-hour interval, 4 times. Now, the specifics of each visit:

First Encounter

Ordinary feeding with one unit of fish. You can and should feed it throughout the "evolution".

Second Encounter

Rescuing a friend stuck in the seaweed. The sharp blades of Beidou's Q ability, released by the character with her talent, are handy in this case.

Third Encounter

Fighting mechanical skates. The glowing plump nearby lends you its ability, making the task easier.

Fourth Encounter

The rendezvous will take place in the Chasm, With Wind Comes Glory. Along with it comes a heartfelt farewell dialogue. As a token of gratitude, the little friend will leave a lavish chest and the achievement "Plump Evolution Theory", setting sail for distant lands.

I hope the article was helpful. Although it ended on a slightly sad note, don't be down. I assure you, Blubberbeast is happy!