[Magiclysm] Add a trait that prevents magical spellcasting (#77543)

* Add the Empty trait

* Make the trait prevent all non-psionic spellcasting even more

* Remove unneeded NON_THRESH

data/mods/Magiclysm/eoc_spell_difficulty_modifiers.json

@@ -128,5 +128,16 @@
       { "math": [ "u_spellcasting_adjustment('difficulty', 'flag_whitelist': 'TRANSFORMATION_SPELL')", "=", "999" ] },
       { "math": [ "u_spellcasting_adjustment('cost', 'flag_whitelist': 'TRANSFORMATION_SPELL')", "=", "999" ] }
     ]
+  },
+  {
+    "type": "effect_on_condition",
+    "id": "EOC_NO_CASTING_FOR_EMPTY",
+    "eoc_type": "EVENT",
+    "required_event": "opens_spellbook",
+    "condition": { "u_has_trait": "MAGIC_EMPTY" },
+    "effect": [
+      { "math": [ "u_spellcasting_adjustment('difficulty', 'flag_blacklist': 'PSIONIC')", "=", "999" ] },
+      { "math": [ "u_spellcasting_adjustment('cost', 'flag_blacklist': 'PSIONIC')", "=", "999" ] }
+    ]
   }
 ]

data/mods/Magiclysm/traits/mutation.json

@@ -385,5 +385,19 @@
     "starting_trait": false,
     "category": [ "CHIMERA" ],
     "flags": [ "UNCANNY_DODGE" ]
+  },
+  {
+    "type": "mutation",
+    "id": "MAGIC_EMPTY",
+    "name": { "str": "Empty" },
+    "//": "This is intended to prevent magical spellcasting.  Psionics don't need mana, so they can be used even as an Empty.",
+    "points": -10,
+    "description": "You are one of the Empty, the rare few unable to cast even the simplest spells.  Your complete lack of mana prevents you from ever casting any magic, no matter how well you know it.  At least it doesn't prevent the use of magical items and potions.",
+    "purifiable": false,
+    "valid": false,
+    "starting_trait": true,
+    "types": [ "MANA_ADD", "MANA_REGEN", "MANA_MULT" ],
+    "flags": [ "NO_SPELLCASTING" ],
+    "enchantments": [ { "values": [ { "value": "REGEN_MANA", "multiply": -1 }, { "value": "MAX_MANA", "multiply": -1 } ] } ]
   }
 ]