how do i make a block script that makes you take less or no dammage?

like I hold a button down and I ether take less or no damage. Can anyone help me with that?

Making a no damage script would be easy, since all you would need to do is create an invisible ForceField.

However if you would want to make weapons deal less damage to you, the best solution would be to modify their scripts directly.

Although you can still do something like my example below, it won't prevent you from dying if the damage sets your hp to 0.

local plr = game:GetService("Players").LocalPlayer

local takeLessDmg = false

game:GetService("UserInputService").InputBegan:Connect(function(iobj, gp)
	if gp then return end
	if iobj.KeyCode == Enum.KeyCode.Z then --an example
		takeLessDmg = true
	end
end)

game:GetService("UserInputService").InputEnded:Connect(function(iobj, gp)
	if gp then return end
	if iobj.KeyCode == Enum.KeyCode.Z then --an example
		takeLessDmg = false
	end
end)

local char = plr.Character
local function CharAdded(char)
	local hum = char:WaitForChild("Humanoid")
	local hpBefore = hum.Health
	hum.HealthChanged:Connect(function(hp)
		local damageTaken = hpBefore - hp
		if damageTaken <= 0 then--if healed and not damaged
			hpBefore = hp
			return
		end
		if not takeLessDmg then
			hpBefore = hp
			return
		end
		hum.Health = hum.Health + damageTaken / 2 --take 1/2 of the damage
		hpBefore = hum.Health
	end)
end

plr.CharacterAdded:Connect(CharAdded)
if char then
	CharAdded(char) --in case the script missed the first CharacterAdded event
end