diff --git a/Resources/Prototypes/Entities/Mobs/NPCs/animals.yml b/Resources/Prototypes/Entities/Mobs/NPCs/animals.yml
index b6ebc82bfd..ddc6a548d8 100644
--- a/Resources/Prototypes/Entities/Mobs/NPCs/animals.yml
+++ b/Resources/Prototypes/Entities/Mobs/NPCs/animals.yml
@@ -114,6 +114,7 @@
   - type: UtilityAI
     behaviorSets:
     - UnarmedAttackHostiles
+    - Idle
   - type: AiFactionTag
     factions:
     - SimpleHostile
@@ -1106,6 +1107,7 @@
   name: tarantula
   parent: MobGiantSpider
   id: MobGiantSpiderAngry
+  suffix: Angry
   components:
     - type: AiFactionTag
       factions:
diff --git a/Resources/Prototypes/Entities/Mobs/NPCs/simplemob.yml b/Resources/Prototypes/Entities/Mobs/NPCs/simplemob.yml
index 328591e26f..ad9fb4393d 100644
--- a/Resources/Prototypes/Entities/Mobs/NPCs/simplemob.yml
+++ b/Resources/Prototypes/Entities/Mobs/NPCs/simplemob.yml
@@ -79,7 +79,7 @@
         Heat: 1 #per second, scales with number of fire 'stacks'
   - type: Temperature
     heatDamageThreshold: 360
-    coldDamageThreshold: 260
+    coldDamageThreshold: 0
     currentTemperature: 310.15
     coldDamage:
       types:
diff --git a/Resources/Prototypes/Entities/Mobs/NPCs/spacetick.yml b/Resources/Prototypes/Entities/Mobs/NPCs/spacetick.yml
index 4f555d9ce7..67d15dca6b 100644
--- a/Resources/Prototypes/Entities/Mobs/NPCs/spacetick.yml
+++ b/Resources/Prototypes/Entities/Mobs/NPCs/spacetick.yml
@@ -57,7 +57,6 @@
     damage:
       groups:
         Brute: 2
-
   - type: MeleeChemicalInjector
   - type: SolutionContainerManager
     solutions:
diff --git a/Resources/Prototypes/Entities/Mobs/NPCs/xeno.yml b/Resources/Prototypes/Entities/Mobs/NPCs/xeno.yml
index abe89848a1..3b59baed04 100644
--- a/Resources/Prototypes/Entities/Mobs/NPCs/xeno.yml
+++ b/Resources/Prototypes/Entities/Mobs/NPCs/xeno.yml
@@ -89,7 +89,7 @@
       - CannotSuicide
 
 - type: entity
-  name: purple snake
+  name: space adder
   parent: SimpleSpaceMobBase
   id: MobPurpleSnake
   description: A menacing purple snake from Kepler-283c.
@@ -110,10 +110,37 @@
     attributes:
       proper: true
       gender: male
+  - type: UtilityAI
+    behaviorSets:
+    - Idle
+    - UnarmedAttackHostiles
+  - type: AiFactionTag
+    factions:
+    - Xeno
+  - type: UnarmedCombat
+    range: 1.5
+    arcwidth: 0
+    arc: bite
+    damage:
+      types:
+        Piercing: 5
+  - type: MeleeChemicalInjector
+  - type: SolutionContainerManager
+    solutions:
+      melee:
+        reagents:
+        - ReagentId: Toxin
+          Quantity: 50
+  - type: RefillableSolution
+    solution: melee
+  - type: InjectableSolution
+    solution: melee
+  - type: SolutionTransfer
+    maxTransferAmount: 3
 
 - type: entity
-  name: purple snake
-  parent: SimpleSpaceMobBase
+  name: space adder
+  parent: MobPurpleSnake
   id: MobSmallPurpleSnake
   suffix: small
   description: A smaller version of the menacing purple snake from Kepler-283c.
@@ -130,7 +157,5 @@
       normal: purple_snake
       crit: dead_small_purple_snake
       dead: dead_small_purple_snake
-  - type: Grammar
-    attributes:
-      proper: true
-      gender: male
+  - type: SolutionTransfer
+    maxTransferAmount: 1