This pack adds the mechanic of end crystals disabling powers within a 25 block radius. If you have the power Realm Hopper (that you can get from here) you can see when different powers have had their powers disabled by their particles.
If you need to be able to see the area of effect of the end crystals run the following command
/tag @s add crystal_vision
and if you need to stop seeing the area of effect run this
/tag @s remove crystal_vision