When it comes time to go for the head of the echo, I press the button to enter the echo and it stays as if it doesn’t work and it doesn’t matter how many times I hit it, it doesn’t move forward and I can make other echoes, but not the one from the echo. boss, for now I have tried the
black sun monolith.
Same issue, shows enough stability for boss but Enter This Echo doesn’t work for boss fight, and only the boss fight.
The Age Of Winter
Happened to me as well, as a workaround, you can do the two “optional” quests and you will then be able to fight the boss.