diff --git a/ChangeLog b/ChangeLog
index 047e4fb78..138d8c6b7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,16 @@
+Prevent nonintelligent living monsters from being charmable.
+This includes acid spheres, slimes, blobs, and some others.
+Basically all of these are of race slime.
+Mechanically, these monsters don't have a brain, so they logically cannot be charmed.
+monster/acid/acidsphere.arc
+monster/acid/slimecrawler/slimecrawler.arc
+monster/acid/bpudding.arc
+monster/acid/greenslime.arc
+monster/acid/slime.arc
+monster/misc/blob.arc
+monster/misc/firechest.arc
+Daniel Hawkins 2023-05-01
+
 Add one_hit to magic missile.
 For server version a763845fa3 or later, this will prevent magic missiles from
 having a magic-bullet-like piercing effect when they overkill enemies. For
diff --git a/monster/acid/acidsphere.arc b/monster/acid/acidsphere.arc
index 4d6ba5eab..803521a1d 100644
--- a/monster/acid/acidsphere.arc
+++ b/monster/acid/acidsphere.arc
@@ -38,4 +38,7 @@ speed 0.01
 anim_speed 1
 exp 100
 one_hit 1
+# It's literally a blob of acid.
+# Charming it would require it to have intellect
+no_mood_change 1
 end
diff --git a/monster/acid/bpudding.arc b/monster/acid/bpudding.arc
index 866fa45e0..85ffc3562 100644
--- a/monster/acid/bpudding.arc
+++ b/monster/acid/bpudding.arc
@@ -26,6 +26,7 @@ attacktype 64
 resist_fire -100
 resist_blind 100
 hitback 1
+no_mood_change 1
 end
 Object black_pudding_grow
 name black pudding
@@ -50,6 +51,7 @@ level 7
 attacktype 64
 resist_fire -100
 hitback 1
+no_mood_change 1
 end
 Object black_pudding_split
 name black pudding
@@ -74,4 +76,5 @@ level 7
 attacktype 64
 resist_fire -100
 hitback 1
+no_mood_change 1
 end
diff --git a/monster/acid/greenslime.arc b/monster/acid/greenslime.arc
index f26f61f3c..d09c3b804 100644
--- a/monster/acid/greenslime.arc
+++ b/monster/acid/greenslime.arc
@@ -21,4 +21,5 @@ attacktype 64
 hitback 1
 hp 40
 maxhp 40
+no_mood_change 1
 end
diff --git a/monster/acid/slime.arc b/monster/acid/slime.arc
index 51f3a87ed..99a520cf3 100644
--- a/monster/acid/slime.arc
+++ b/monster/acid/slime.arc
@@ -28,4 +28,5 @@ maxhp 5
 level 1
 speed 0.06
 weight 20000
+no_mood_change 1
 end
diff --git a/monster/acid/slimecrawler/slimecrawler.arc b/monster/acid/slimecrawler/slimecrawler.arc
index 6578dffc0..b32161b84 100644
--- a/monster/acid/slimecrawler/slimecrawler.arc
+++ b/monster/acid/slimecrawler/slimecrawler.arc
@@ -30,4 +30,5 @@ resist_cold 50
 resist_physical 40
 resist_acid 90
 resist_blind 80
+no_mood_change 1
 end
diff --git a/monster/misc/blob.arc b/monster/misc/blob.arc
index 7592e5e55..a9cab0b63 100644
--- a/monster/misc/blob.arc
+++ b/monster/misc/blob.arc
@@ -27,4 +27,5 @@ weight 50000
 run_away 100
 pick_up 64
 attacktype 1
+no_mood_change 1
 end
diff --git a/monster/misc/firechest.arc b/monster/misc/firechest.arc
index 0de6751e4..b8f2c6195 100644
--- a/monster/misc/firechest.arc
+++ b/monster/misc/firechest.arc
@@ -12,4 +12,5 @@ level 1
 no_pick 1
 resist_fire 100
 direction 0
+no_mood_change 1
 end