ok so you are strictly making the void series direct max hp manipulation, you really dont want to use a wound system parallel to poison?
that is ok, but if it is i need to do the balm/salve of that premise, as it is there is no way to stop void from winning if its alive long enough, you will run out of max hp unless something gives it to you regularly. there is no reason you cant have direct max hp loss and wound/bleeding counters at the same time and a poison-purity system too, elements has always been about diverse strategies.