As a living Archlich, you cannot consume healing items, be healed by spells other than necromancies, or make death saves. If your HP drops to 0 your body will instantly crumble to dust (leaving all your gear behind) and begin reforming adjacent to your phylactery 1d20 days after your death. If there is not enough space for you to reform directly adjacent to your phylactery, you cannot reform until there is. If there is an empty vessel (such as a clone of yourself) within 30ft of your phylactery, it will instead fill that vessel with the necessary necromantic energy and negate the need to reform. If your phylactery has been destroyed, you cannot reform, but if your body is still alive your soul returns to it and you are no longer a living Archlich. If your body is not alive or is in the process of reforming when you die, your soul is lost and you die irreversibly.