Collect Light Seeds from the place where you fought and run along the edge to find a metal stick protruding from the tower. Lower yourself on it and then jump towards Light Seeds number 4 and 5.
Take few steps back and start running on the wall. If you did it right, the character should start sliding down the wall in the proper place to collect other Light Seeds.
You have to start climbing again to the top inside the tower.
Head towards the top of the tower all the time.
Light Seeds from 21 to 26 are situated in the corridor leading to Coronation Hall.
27-31 can be obtained after using Breath of Ormazd ability.
At the exit of the tower there is a tall column. Don't jump on it but jump to a lower level from that place. As a result, you will collect two Light Seeds. Then pull a metal hoop and finally jump onto the tall column.
Collect Light Seeds from 34 to 38 by walking on narrow footbridges. 40 and the other ones are situated in the corridor leading to the Reservoir.
41 and the other ones - in the corridor leading to the Reservoir.