Is 30k hp even necessary? Because i just started hp washing at lvl 138 and only have 16k hp atm. Would my char still be ok? And just to make sure im doing things right, Hp washing is putting 1 into hp, 4 into main stat, then taking 1 out of mp right? Ty!
16k HP is more than enough for any boss currently out. As long as you have more MP than your minimum class amount, you should wash it out.
In a simplified sense, yes. That is what HP washing is. If you had the money, you would put all 5 instead. Everything I'm about to say below is not necessary. To add on to what plenty said, there is this thing called MP washing where you have a certain amount of base INT eg 100 int because with higher base INT, you get more MP from every fresh AP put into MP. This is a more costly process but it can help you to hit 30k faster. Don't forget to wear some INT gear too before leveling. They help with MP gained upon leveling (higher base INT also helps this too) Just take note that INT from INT gear does not affect the amount of MP gained for each fresh AP used. I.e. Having 100 base INT works, having 4+96 INT from gear doesn't.