[2022] The Durability Patch will be the biggest balance patch ever (if it passes through PBE atm)

This is an absolute bloodbath of nerfs to compensate on the advantages champions get that prioritize on shielding and healing after the whole champion durability buffs.

I want to really emphasize the bolded part here. If we don't act on healing and shielding, their relative power levels go up quite significantly and champions with them end up much more powerful relative to champions without them, so we've applied an across the board (with only a small handful of exceptions) approximate nerf on all of them. We additionally elected to go slightly further on healing in order to allow us to nerf grievous wounds, which we feel has been tuned inappropriately too high for a while now (but which requires something like this amount of retuning when we nerf it, so has been difficult to get traction on).

Some nerfs are clear placebos however

These numbers changes are not intended to get you thinking differently about which champion you ought to pick, they're intended to offset the natural advantage that these champions would get if we didn't do anything. The same goes for items and runes - the value of having healing/shielding goes up when burst kills are less frequent & require more resources, so the raw numbers that are 'balanced' relative to other items and runes are lower.

That said, as with everything with the balance of the game around a change this large, I have no doubt that some of these champions will gain or lose more with the patch. As with champions who don't have heals or shields, we'll be addressing those case-by-case in followup balance.

We started exploring them around when preseason shipped. This was the earliest patch we'd have been able to ship them since we started that investigation. They were never at any point intended for last preseason.

It's intended to be a nerf from 5% to 4%, not 5% to 3%.

The target here is nerfing heals from around 10% at level 1 to around 25% at endgame; not all champion spells have the tools for us to nail that perfectly. She definitely should not be nerfed 40%. (We used a different target for shields, as heals are also accounting for Grievous changes)