Creating regional based attacks

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Luau doesn’t currently have a way to fire specifically to a table of clients. You will have to loop through the players within range and fire individually. I don’t know what needs your scripts have, but you could do this either in your attack system or pass the remote you want to fire to players in range into the mob function itself.

Firing inside the function:

local Players = game:GetService("Players")


local Mob = {}
Mob.__index = Mob

function Mob:RadiusEvent(remote)
	for _, Player in Players:GetPlayers() do
		local Character = Player.Character
		if not Character then continue end
		
		local Magnitude = (Character:GetPivot().Position - self.Instance:GetPivot().Position).Magnitude
		local MaxDis = Mob.Config.FollowDistance
		
		if Magnitude < MaxDis then
			remote:FireClient(Player)
		end
	end
end

-- Inside the attack system somewhere
Mob:RadiusEvent(your_remote_event_here)

Firing from attack system somewhere:

local Players = game:GetService("Players")


local Mob = {}
Mob.__index = Mob

function Mob:GetPlayersInRadius(): {Player}
	local PlayersInRange = {}
	
	for _, Player in Players:GetPlayers() do
		local Character = Player.Character
		if not Character then continue end
		
		local Magnitude = (Character:GetPivot().Position - self.Instance:GetPivot().Position).Magnitude
		local MaxDis = Mob.Config.FollowDistance
		
		if Magnitude < MaxDis then
			table.insert(PlayersInRange, Player)
		end
	end
	
	return PlayersInRange
end

-- Inside the attack system somewhere
local RadiusPlayers = Mob:GetPlayersInRadius()

for _,player in pairs(RadiusPlayers) do
    RemoteEvent:FireClient(player)
end
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