Schizophrenic Preamble
Of the four types of elemental damage in Elden Ring, magic, fire, lightning, and holy, the latter consistently draws the shortest straw. In almost every encounter, all of its compatriots either pull ahead or break roughly even in terms of damage, and are rarely challenged by anything more than a select few enemies. Holy damage, in comparison, is mostly used as a tool for absolutely flattening specific types of enemies (read: skeletons and nothing else), while barely tickling most others– in particular, bosses and enemies in endgame areas like Elphael, Leyndell, or Farum Azula, although this nigh-global holy resistance pops up almost throughout the entire game, including in places where it absolutely should not be. Did you know that Royal Revenants, which are hurt by healing spells, have 60% holy damage resistance, and Fortissax, a dragon cursed with death - the one thing that is vulnerable to holy damage - has a resistance of EIGHTY PERCENT? 
This balancing issue, thankfully, has been (mostly) addressed in the Shadow of The Erdtree DLC. Several bosses and enemies are neutral, occasionally even vulnerable, to holy damage, while resistances to the element have been (mostly) restricted to thematically appropriate foes. However, the holy element still feels lacking throughout most of the experience, still falling behind the other elements in terms of usefulness. That, and the balance of the base game hasn’t changed whatsoever. So, something needs to change. But what? 

What This Mod Does
This mod aims to bring holy damage up to par with its contemporaries while still maintaining its characteristic flair. It reduces the holy defenses of a lot of bosses and enemies, particularly those which are in opposition to the Erdtree, such as rotten, crucible, or ghostly enemies, while keeping (or only slightly lowering) the holy reduction of things closely aligned with the golden order. In this manner, holy damage still excels at nuking specific enemies while remaining relatively weak against holier ones, although usually not to the degree that it once was. Other elements don’t get throttled against this many enemies. Why should Holy damage?

The Specifics
Below, you’ll find a list of what enemies have had their resistances reduced, and by how much. All numbers are percentage of holy damage resisted. For the sake of space, enemies that haven’t had their resistances changed aren’t listed, with the exception of remembrance bosses.

Remembrance Bosses

• Godrick (and Godefroy)
  
  • 40 → 20
    
• Rennala
  
  • No change
    
• Radahn
  
  • 40 → 0
    
• Regal ancestor
  
  • No change
    
• Morgott
  
  • 40 → 30
    
• Astel (and malformed stars)
  
  • 40 → 0
    
• Rykard
  
  • 40 → 20
    
• Fortissax
  
  • 80 → -50
    
• Fire giant
  
  • 20 → -10
    
• Mohg (Blood Lord & Omen)
  
  • 40 → 0
    
• Maliketh
  
  • 80 → 60
    
• Placidusax
  
  • No change
    
• Godfrey / Hoarah Loux
  
  • 40 → 20 (Phase 2)
    
• Malenia
  
  • 40 → 0
    
• Radagon / Elden Beast
  
  • 80 → 50 (Radagon)
  • No change (Elden Beast (It’s literally the thing that created holy damage))
    

Remembrance Bosses (SOTE)

• Dancing Lion
  
  • No change
    
• Rellana
  
  • No change
    
• Putrescent Knight
  
  • No change
    
• Gaius
  
  • No change
    
• Scadutree Avatar
  
  • No change
    
• Messmer
  
  • 40 → 20 (Phase 1)
    
• Romina
  
  • 20 → -20
    
• Metyr
  
  • No change
    
• Midra
  
  • 20 → 0
    
• Bayle
  
  • No change
    
• Radahn 2, Miquellectric Boogaloo
  
  • No change (has surprisingly low holy resist)
    

‘Great Enemy’ Bosses

• Margit
  
  • 40 → 20
    
• Dragonkin Soldiers
  
  • 20 → 10
    
• Leonine Misbegotten
  
  • 20 → 0
    
• Decaying Ekzykes
  
  • -40 → -80
    
• Godskins
  
  • 40 → 0
    
• Commander O’Neil
  
  • 20 → -20
    
• Loretta
  
  • 20 → -20
    

‘Great Enemy’ Bosses (SOTE)

• No changes.
  

‘Enemy’ Bosses

• Crucible Knight
  
  • 40 → 20
    
• Black Blade Kindred
  
  • 80 → 60
    
• Black Knife Assassin
  
  • 40 → 10
    
• Deathbird / Death Rite Bird
  
  • -40 → -60
    
• Putrid Avatar
  
  • 40 → -20
    
• Putrid Tree Spirit
  
  • 40 → -20
    
• Fallingstar Beasts
  
  • 20 → 0
    
• Onyx Lords
  
  • 20 → 0
    
• Alabaster Lords
  
  • 20 → 0
    
• Elemer / Bell Bearing Hunter
  
  • 40 → 10
    
• Wormface
  
  • 40 → -50
    

‘Enemy’ Bosses (SOTE)

• No changes.
  

Field Enemies

• Abductor Virgin
  
  • 20 → 0
    
• Ancestral Follower
  
  • 0 → -20
    
• Blackflame Monk
  
  • 20 → 0
    
• Caelid Crow
  
  • -20 → -40
    
• Caelid Dog
  
  • -20 → -40
    
• Cleanrot Knight
  
  • 40 → -20
    
• Frenzied Troll
  
  • 0 → -20
    
• Frenzied Villager
  
  • 0 → -40
    
• Giant Ant
  
  • 0 → -20
    
• Ghost Exile
  
  • 0 → -50
    
• Ghost Banished Knight
  
  • 20 → -40
    
• Kindred Of Rot
  
  • 0 → -20
    
• Lion Guardian
  
  • 0 → -20
    
• Man-Serpent
  
  • 0 → -20
    
• Mausoleum Foot Soldier
  
  • -20 → -60
    
• Mausoleum Knight
  
  • 0 → -40
    
• Mausoleum Soldier
  
  • -20 → -60
    
• Misbegotten
  
  • 0 → -40
    
• Omen
  
  • 20 → -20
    
• Putrid Corpses
  
  • -40 → -100
    
• Revenant
  
  • 40 → -100
    
• Royal Revenant
  
  • 40 → -100
    
• Rotten Stray
  
  • -20 → -100
    
• Sanguine Noble
  
  • 20 → -20
    
• Servant of Rot
  
  • 0 → -40
    
• Silver Tears
  
  • 20 → 0
    
• Skeletal Slime
  
  • 40 → 0
    
• Spirit Jellyfish
  
  • 0 → -40
    
• Starcaller
  
  • 0 → -20
    

Field Enemies (SOTE)

• Bloodfiend
  
  • 20 → -20
    
• Furnace Golem
  
  • 40 → 20
    
• Gravebird
  
  • 40 → 0
    
• Spider Scorpion
  
  • 20 → 0
    

…and also a few enemies that I definitely changed but forgot the names of.