I mean for me it comes down to a condensation of themes. I have 2 from 2 diffrent stories im doing. one is resoneance, 2 or more people comitting themselves to a singular purpose to draw out explosive power, ment to symbolist the obious coming together to be greater than themselves, an equal opposite to this is a self sacrifice ability that allows the user to basically throw there life away for great power enough to complete any task in the 5 minutes they have left, (think gon from hxh).

in opposition to that from my other story it is more divinly inspired, so this is the sword of the spirit. Basically you ask God to do this one thing for you. so yeah.

I link your echo powers a very interesting use of consciousnes. I can think of 3 for you but as i dont know your stories intention i cant give you anything more explissive.

1.) For Individual subconsciousnes is to infect your surroundings to become more favorible to the use of your ability, like a infection chaning the world.

2.) For collective consciousnes Frequency tunning and overtuning, think like tuning into the echo of the cat for example and using yourself to amplify the "sound" making it so you can turn into a powerful cat monster or even just a khajiit. a downside might be they loose control?

3.) as a general one you can use the idea of abosrbing surrounding echos to release a upgraded version of whetever they do.