In hub area, go up and to the right, there will be infinite corridor, go through it 5-7 times and you will end up in forbidden grounds, there all way to the left will be door to conjuring world Lir, there will be red flying thing-oneshot-boss, beat it by using levers. After that you will get transported to another dark place, there will be few hard enemies, but you can go past them and in first room all way to the right there will be small barely visible corridor, enter it, there in outdoors location go all way down and get Esbets soul, after this proceed further as I written above👍
And there will actually be one more boss, almost in the end of game, there will be idol in wich you put kings emblem, it will teleport you to other place, IMMEDIATELY go all the way to the left and destroy wall to get to pedestal, this one is crucial too because it can lock out you if ending too. So beware.
By the way, if you do accidentally miss some of steps, you can use save editor as last resort.