Does anyone know how to get the ancient keys?

[知足常乐]

In the dark temple of the snow mountain, I could not find the key！
And my game has become easier to crash than ever

[Playforfood]

from the chest

[知足常乐]

Messaggio originale di Playforfood:

from the chest

Could you tell me more details about how to get it?

[知足常乐]

Does anyone know the ancient keys on any animal?