How to use magnitude in a different way?

So I wanted to make a proximity script which is a script that activates a function after some object is within a certain range so I wanted to make it so when I press "q" I can get all the objects within a certain magnitude of my torso and do something with them..... However the only time I've seen magnitude being used is when people subtract positions of 2 CERTAIN objects and then they get the magnitude of the solution and then confirm if the objects are within a certain range. However I want to use it so any object within a certain range of my torso get deleted or something of that sort.... My question for this is if that is possible and if it is please tell me how I would because I have no idea where to go with this....

There's something called FindPartsInRegion3 which allows you to get parts within a box (returned as a table). It's worth noting that FindPartsInRegion3 is limited to 100 parts.

local player = game.Players.LocalPlayer -- assuming this is a LocalScript
local character = player.Character or player.CharacterAdded:wait()

function getPartsInRadialBox(origin, radius)
	local a = origin - Vector3.new(radius, radius, radius) -- these two lines find the two points needed to make a Region3
	local b = origin + Vector3.new(radius, radius, radius) 
	local region = Region3.new(a, b) -- create a region out of two points
	return game.Workspace:FindPartsInRegion3(
		region, -- find parts in the region
		character, -- ignore parts that are part of our character.
		100) -- get at most 100 parts (which is the limit)
end

function activateSkill(radius)
	local pos = character:FindFirstChild("Torso").Position
	local parts = getPartsInRadialBox(pos, radius)
	--TO-DO: Iterate through the parts and do something
end

--TO-DO: button to activate the skill