If you can't open doors, find a key (which doesn't have to look like key) or a switch that opens them.
If I understood where you are, you need yellow glowing gem to remove dark barrier.
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Dulce et decorum est pro patria mori, adhuc dulcius pro patria vivere.
(It is sweet and glorius to die for one's homeland, even sweeter to live for it)
Horatio
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