Senha antes de ativar é : 2 6 8
Tem que ativar o circulo e depois ir atras da montanha matar uma cabra para sacrificio

Yes find Sheep on the mountain, i added screenshot

For the lower altar you should type each number individually and press enter after each:
2
6
8
Do not send them in the same message or it won't work.


In case you're curious: It's the order for the books of Sacrifice, Service and Morality that are lying around the altar. You can learn that by talking to Ashen Wing, who’s standing nearby.