What to use for dealing damage from players in a certain range?

So I have a grenade that is still a work in progress, and unlike all the grenade models I could find, it uses a custom explosion particle instead of the standard roblox explosion, but here's the problem; the other grenades use the standard roblox explosion to deal damage, and I don't know what to use to make the grenade deal damage with a particle.

To do this, you have several options. Some of them are using Region3 and then get parts in that region or using magnitude. I will use magnitude right now and then you can look into Region3 later.

local Players = game:GetService("Players");
local totalDamage = 100;
local damageReduce = 1 -- How much you want to reduce the total damage from the player (based on how far the player is from the explosion)

function getPlayersInRange(position, range)
	local players = Players:GetPlayers();
	local foundPlayers = {};
	
	for num, player in pairs(players) do
		local character = player.Character;

		if character then
			local torso = character:FindFirstChild("Torso") or character:FindFirstChild("LowerTorso");
			if torso then
				local distance = (torso.Position - position).magnitude
				if distance <= range then
					table.insert(foundPlayers, { player=player, distance=distance})
				end
			end
		end
	end

	return foundPlayers;
end

function damagePlayers (position)
	local results = getPlayersInRange(position, 50) -- Getting players within 50 studs
	print(#results)
	
	for _, result in pairs(results) do
		local player, distance = result.player, result.distance;
		local playerDamage = (totalDamage - (distance * damageReduce))
		
		local humanoid = player.Character:FindFirstChildOfClass("Humanoid");
		humanoid:TakeDamage(playerDamage);	
		
		print("Dealt", playerDamage, "damage to", player.Name)
	end
end

damagePlayers(workspace.Baseplate.Position)