Roblox - Death on CrackedLava Terrain Script

-- Roblox Script to trigger/detect when players walk on CrackedLava terrain and kill them
-- Create this as a new Script on your Terrain object.

function onTheLava(character)
    local checkRay = Ray.new(character.HumanoidRootPart.Position, Vector3.new(0, -50, 0))
    local gridPart, intersect, surface, material = game.Workspace:FindPartOnRay(checkRay,nil,true,true)
    if (material.Name == "CrackedLava") then
        return true
    end
    return false
end

function onTouched(hit)
    if hit.Parent then
        if hit.Parent:FindFirstChild("Humanoid") then
            local vPlayer = game.Players:playerFromCharacter(hit.Parent:FindFirstChild("Humanoid").Parent)
            if (vPlayer ~= nil) then
                local char = hit.Parent:FindFirstChild("Humanoid").Parent
                if onTheLava(char) then
                    hit.Parent.Humanoid.Health = 0
                end
            end
        end
    end
end

script.Parent.Touched:connect(onTouched)