There is also Heavenly/HP, which boosts hp by 100. It only drops on Pinkal from very hard Merissa AA. You can use other hp units with No0b/hp too. HP units are ok when leveling up, but you can also farm up hp mats for your chars too (every char can use 125 hp mats for 250 more hp), and also know that too much hp can be a detriment at high levels, when certain dangerous attacks no longer knock you down and begin to hit you several times in quick succession instead of just once. Generally around 1600 hp is ideal imo, enough to not be one shot by bringer charge shot / falz blue ballz crit / vol opt laser / etc and give them a chance to activate mag assist, but not too much to still survive attacks that would multihit if higher (saint milion tornado needs <1600, shambertin/kondrieu tornados need a bit more). Also you can leave a no0b/hp equipped to lower your hp below those amounts for those fights, that was part of its original design purpose; the extra hp from unequipping turned out to be a bug since pso does not like negative numbers.