diff --git a/data/mods/Xedra_Evolved/monsters/zombies.json b/data/mods/Xedra_Evolved/monsters/zombies.json
index c48a5afeeb3a2..1c36acba1ff01 100644
--- a/data/mods/Xedra_Evolved/monsters/zombies.json
+++ b/data/mods/Xedra_Evolved/monsters/zombies.json
@@ -20,7 +20,7 @@
           "monster_message": "%1$s flickers and all of its injuries disappear!"
         }
       ],
-      "upgrades": { "half_life": 30, "into_group": "GROUP_ZOMBIE_MONOCHROME_UPGRADE" }
+      "upgrades": { "half_life": 25, "into_group": "GROUP_ZOMBIE_MONOCHROME_UPGRADE" }
     },
     {
       "id": "mon_zombie_monochrome_2",
@@ -44,7 +44,7 @@
           "monster_message": "%1$s flickers and all of its injuries disappear!"
         }
       ],
-      "upgrades": { "half_life": 30, "into": "mon_zombie_monochrome_3" },
+      "upgrades": { "half_life": 25, "into": "mon_zombie_monochrome_3" },
       "extend": { "flags": [ "STABILIZED_TIMELINE" ] }
     },
     {
@@ -77,6 +77,7 @@
           "monster_message": "the ground around %1$s starts eroding into nothingness."
         }
       ],
-      "extend": { "flags": [ "STABILIZED_TIMELINE" ] }
+      "extend": { "flags": [ "STABILIZED_TIMELINE" ] },
+      "upgrades": false
     }
   ]
\ No newline at end of file