"there is a gui above all players head and each second it gives 1 power and each time players click it explodes where they click make it so there is a 5 second cooldown the more power the more it hurts players but if you die you loose your power"

-- server script 
local gui = Instance.new("ScreenGui")
gui.Parent = game.Players.LocalPlayer.PlayerGui

local frame = Instance.new("Frame")
frame.Parent = gui
frame.Size = UDim2.new(0.2, 0, 0.2, 0)
frame.Position = UDim2.new(0.4, 0, 0.4, 0)

local text = Instance.new("TextLabel")
text.Parent = frame
text.Size = UDim2.new(1, 0, 1, 0)

local power = 0

game.Players.PlayerAdded:Connect(function(player)
	local leaderstats = Instance.new("Folder")
	leaderstats.Name = "leaderstats"
	leaderstats.Parent = player
	
	local power = Instance.new("NumberValue")
	power.Name = "Power"
	power.Value = 0
	power.Parent = leaderstats
	
	local cooldown = Instance.new("NumberValue")
	cooldown.Name = "Cooldown"
	cooldown.Value = 0
	cooldown.Parent = leaderstats
end)

game.Players.PlayerRemoving:Connect(function(player)
	player.leaderstats:Destroy()
end)

while wait(1) do
	for _, player in pairs(game.Players:GetPlayers()) do
		player.leaderstats.Power.Value = player.leaderstats.Power.Value + 1
	end
end

game.Players.PlayerAdded:Connect(function(player)
	player.CharacterAdded:Connect(function(character)
		local mouse = player:GetMouse()
		
		mouse.Button1Down:Connect(function()
			if player.leaderstats.Cooldown.Value == 0 then
				local ray = Ray.new(mouse.Hit.p, mouse.Hit.lookVector * 100)
				local part, position = workspace:FindPartOnRayWithIgnoreList(ray, {character})
				
				if part then
					local explosion = Instance.new("Explosion")
					explosion.Parent = workspace
					explosion.Position = position
					explosion.BlastRadius = player.leaderstats.Power.Value * 5
					
					player.leaderstats.Power.Value = 0
					player.leaderstats.Cooldown.Value = 5
				end
			end
		end)
	end)
end

while wait(1) do
	for _, player in pairs(game.Players:GetPlayers()) do
		if player.leaderstats.Cooldown.Value > 0 then
			player.leaderstats.Cooldown.Value = player.leaderstats.Cooldown.Value - 1
		end
	end
end

game.Players.PlayerAdded:Connect(function(player)
	player.CharacterAdded:Connect(function(character)
		local humanoid = character:WaitForChild("Humanoid")
		
		humanoid.Died:Connect(function()
			player.leaderstats.Power.Value = 0
		end)
	end)
end)

game.Players.PlayerAdded:Connect(function(player)
	player.CharacterAdded:Connect(function(character)
		local humanoid = character:WaitForChild("Humanoid")
		
		humanoid.Changed:Connect(function(property)
			if property == "Health" then
				if humanoid.Health <= 0 then
					player.leaderstats.Power.Value = 0
				end
			end
		end)
	end)
end)

game.Players.PlayerAdded:Connect(function(player)
	player.CharacterAdded:Connect(function(character)
		local humanoid = character:WaitForChild("Humanoid")
		
		humanoid.HealthChanged:Connect(function(health)
			if health <= 0 then
				player.leaderstats.Power.Value = 0
			end
		end)
	end)
end)

game.Players.PlayerAdded:Connect(function(player)
	player.CharacterAdded:Connect(function(character)
		local humanoid = character:WaitForChild("Humanoid")
		
		humanoid.MaxHealthChanged:Connect(function(maxHealth)
			if humanoid.Health <= 0 then
				player.leaderstats.Power.Value = 0
			end
		end)
	end)
end)

game.Players.PlayerAdded:Connect(function(player)
	player.CharacterAdded:Connect(function(character)
		local humanoid = character:WaitForChild("Humanoid")
		
		humanoid.MaxHealth = humanoid.MaxHealth + player.leaderstats.Power.Value
	end)
end)

game.Players.PlayerAdded:Connect(function(player)
	player.CharacterAdded:Connect(function(character)
		local humanoid = character:WaitForChild("Humanoid")
		
		text.Text = "Power: "..player.leaderstats.Power.Value
		text.Parent = humanoid.Head
	end)
end)