Guide The Health Regen Formula Has Been Reverse Engineered

Here's a bit of a minithread while I procrastinate work on the archer testing; the way health regen, and specifically natural hpr works has been a bit of a mystery to many of us, so we decided to try to reverse engineer what is going on.


(it wasn't that bad)

The Basics:
There are four components of the health regen formula: raw hpr, %hpr, natural hpr, and true hpr

Raw and %hpr are the easiest to explain so I'll start there:
- raw hpr is the raw hpr id stat in your build.
- %hpr is the percent hpr id stat in your build.
Simple.

True hpr can be thought of as sort of similar to the penalty for repeated spell costs if you are familiar with that. Basically, if you do regen positive health, it will always be at least 3—this value is the true hpr used in the formula. It's simple (true hpr = 3) but I think it's kind of important to give it a name before I stick it in the formula later so it's clear where it comes from.

Natural hpr
This is arguably the most complicated part of the formula, so I'll dedicate a whole section to it.

The natural hpr value (later used in the final formula) depends on three factors: current mana, current health, and maximum health.

@CrunchyCol tested for a series of ticks starting at 1hp with a maximum hp of 10k, which I plotted on desmos here:

Spoiler: data

In a bit of basic testing, we found that the first tick from 1hp was always about 1/60th of max hp + 3 (true hpr foreshadowing!?), and with that information, @hppeng quickly pointed us towards exponential functions, and we found the correct formula on our third or fourth try:

mmmm exponential equations

Spoiler: the graph with the curve

As you can see, mana has an impact on raw hpr, but only to an extent; being at zero mana essentially cuts your natural hpr by a flat 40% regardless of current hp.

Case 1:
Now for the final formula. Here is the most common case:



This case applies when natural + raw is greater than zero.

The natural value we calculate from the step above is added to the raw value in the build, all multiplied by 1 + % (for instance, 100% hpr leads to a 2x multiplier here), and then finally the true +3 is added. Overtime, as current health increases, natural decreases towards zero, which is why builds with no raw hpr eventually only gain 3 health per tick (true hpr).

Case 2:
Another case occurs when the raw + natural value is less than zero, and the percent hpr is not above 100%.



The only difference here is how the % is applied: when you have negative raw + natural, negative % amplifies the effect of the negative raw/natural, and positive % diminishes it.

It is important to note that some builds can have case 1 apply at low hp, but case 2 at high hp. A common case of this is low -hpr rage hero: when your current hp is particularly low, the natural term will be high enough to make the raw + natural factor greater than zero, leading to case 1 where health is gained. At higher health, as the effect of natural diminishes, we shift to case 2, and hp decreases back down towards a number where it stabilizes (assuming your mana stays constant).

EDIT: @iTechnically has pointed out that cases 1 and 2 can be condensed into 1 formula:
hpr = (natural + raw) + |(natural + raw)| * % + true

Also notably, there is a special case within case 2 where %hpr is exactly 100%. The 1-% term is exactly zero, which means the initial part of the equation is neutralized and all that is left is 3, true hpr.

Case 3:
This case applies when natural + raw is less than zero, and % is strictly greater than 100%.

Unlike the last note, this case follows a very simple formula:

yep.

Due to the way hprcancelling was implemented, when natural + raw is negative and % is greater than 100, wynncraft knows to not apply any health regen, including the true hpr. This suggests it is some sort of override, as mathematically we would expect a nonzero result; at least 3 given the position of true hpr in the formula.

This means that for true "hpr-cancel" purposes (for rage builds most importantly), you actually need more than 100% hpr—just having 100% will lead to a gain of 3 hp every 4 seconds.

Credits:
@iTechnically
@CrunchyCol
@Gigavern
@hppeng
@Neptune

 

Here is a two hour video of me watching my hp naturally regenerate:

 

lots of numbers lots of math lots of real world appl--
i enjoy watching the funny hearts change colors at different speeds :slight_smile:

 

I see Guide and I see Atlas Inc people I instant like.

Now for the actual question: why is this formula so complicated.........

 

hey at least we aren't running out of needlessly weird shit to test

 

So, are there any wynncraft mechanics that aren't needlessly complicated and weird?

 

um












no

 

cool thread, as usual tune in next week to find out how your hpr is tied to how many emeralds you will get per mob kill

 

Me when tou takes you seriously and does testing for emerald drop rates per hit with stealing and mob kill loot to calculate your effective hpr with a greed build for every stealing % level




Unless that was serious and you actually are testing it right now

 

oh god that's a good idea why must you do this to me

 

Yes there are, how could you say such a thing.
Determining uhhh
uhhhhhhhhhhhhhhh
there has to be something here
*checks notes*
Ah here we go!
Exploding!

Not even joking if atlas inc finds a way to break exploding I give up.

 

bet.

 

This is so threatening I love it

 

ha ha ha, totally not me getting credited for calling Col then hopping off to sleep

 

When I joked about it yesterday, I had no idea this would happen anytime in the near future, much less today of all days.

Maybe it's time to adjust expectations because this speed is consistently bonkers

 

I noticed that this was happening a while ago, and was wondering if a build could be made that would naturally trend towards a specific health. I imagine this could be useful to hero builds that would want hpr but also need to stay under a certain health, so a formula for equilibrium health could be useful.

 

Great thread as usual, touhoku and co.

You can plug your desired hp target into the natural hpr formula and have negative of that in raw hpr for a very close benchmark (excluding true hpr, but it probably is not worth accounting for that since the change is tiny and you'll get hit anyway).

Note that in this case, you would increase your actual hpr at lower health than your target by running more hpr%.

 

This is something I've noticed, but I've always just thought "werid fucking wynncraft jank" and honestly tried to ignore it.

The only thing i understood was "ogga booga, lower Hp equals bigger number, ogga booga."
And frankly, after reading this, that's still all I understand.

 

hppeng and I have actually already been calculating this for rage hero already, it's pretty simple!

 

why is this so complicated it's just hpr