To complete it, you just need to reflect 3 attacks of cacodemones. We are talking about large flying monsters similar to brains. You will meet them several times at this level. You just need to reflect their green shots. As a reward for the test, you will receive 50 gold units.
After collecting previous ingots, go back and fly through the second green ring to be on the next site, but do not use the third ring soaring on the left side. Instead, go to the edge of the ledge on the right, and you will see new ingots on the site below.
Once at the top, turn around and climb the ladder, walking towards the green statue a little higher, but take halfway to the right and go to the edge of the cliff. Look down and you will see new ingots. Gather them, and then climb the wall on the right to pick up the codes page.
Next, turn around and start sail to the side where they shoot fire balls. Swim past them to the very end, and you will find here 7 more ingots and a green helmet.
