I just double the values found in the DifficultyStatGroupTable.uasset so that enemies will have more health and shield.
For whatever reason doubling the table values result in an augmentation of exactly 80% more shield and life instead of 100%.
Triple values result in 160% more HP/Shield and so on. Here is a quick recap of each version :
- x2 -> HP/SH multiply by 1,8
- x3 -> HP/SH multiply by 2,6
- x4 -> HP/SH multiply by 3,4
- x5 -> HP/SH multiply by 4,2
- x6 -> HP/SH multiply by 5
- x10 -> HP/SH multiply by 8,2
Here is a screenshot without mod:

And with the x2 version mod :

Simple as that, it works on trash mobs and all challenges bosses too.
UPDATE :
-Made a x3/x4/x5/x6/x10 version
-Made an optional file that reduce Eve max health gained per Body core upgrade (you'll gained 200 per upgrade instead of 500), this file use the CharacterLevelTable.uasset so it can be used with main files.
-Added a personal hard mode version :
SPOILER WARNING FOR ALL BOSSES NAMES :
-In the personal version all bosses in hard mode have 5 times more HP/SH (basically the x6 version of the mod) EXCEPT the two Maelstrom bosses, i didn't change anything on them cause i find them boring to fight anyway.
-All trash mob have the x3 version of the mod cause x6 is too much in my taste.
-And for the big piece all bosses have reduced damage to your HP and Shield to counter their raised HP/SH, trash mob keep vanilla values, here are bosses values :
-Tutorial zone : Brute -> 15% less damage
-Eidos 7 : Abaddon -> 15% less damage
-Eidos 7 : Corrupter -> 12% less damage
-Eidos 7 : Gigas -> 17% less damage
-Wasteland : Gigas -> 24% less damage
-Wasteland : Brute -> 15% less damage
-Wasteland : Corrupter -> 12% less damage
-Matrix 11 : Stalker -> 24% less damage
-Matrix 11 : Juggernaut -> 32% less damage
-Matrix 11 : Tachy -> 40% less damage
-Great desert : Abaddon -> 48% less damage
-Great desert : Stalker -> 46% less damage
-Great desert : Behemot -> 48% less damage
-Eidos 9 : Corrupter -> 40% less damage
-Spire 4 : Belial -> 56% less damage (Also for the first fight where he's fleeing)
-Spire 4 : Karakuri -> 64% less damage
-Spire 4 : Democrawler -> 64% less damage
-Xion : Unidentified Naytiba -> 65% less damage
-Nest : Raven -> 70% less damage
-Nest : Providence -> 74% less damage
-Nest : Elder Naytiba -> 74% less damage (I don't have this one unlocked yet, need some testing but it should be the good values)
-Challenge : Mann -> 70% less damage
-Challenge : Scarlet -> 69% (Nice) less damage
Here is one Screenshot for Providence damage on the same attack :
Vanilla :

With this version :

Values are not round up (5,0) for most bosses cause in the table it's not as easy as divide the values, i needed to change values and then test every boss damage and compare the numbers with vanilla hard mode to have roughly the damage i wanted.
I will maybe upload a video but as i want some quality it will probably take some time and i must make it first.
END OF SPOILER
INSTALLATION :
Simply put the three files in :
StellarBlade\SB\Content\Paks\~mods
If the ~mods folder doesn't exist create it.
COMPATIBILITIES :
This mod is incompatible with other mods that modify :
DifficultyStatGroupTable.uasset
Optional file is incompatible with other mods that modify :
CharacterLevelTable.uasset
Since this table also affect enemies damage, tell me if you want me to upload a version with that too.
MY OTHERS MODS :
Life leech and some more Tweaks
Burst and Beta Skills Tweaks
Credits to Orcax1399 for making this Guide for making mods like this.