diff --git a/src/magic.cpp b/src/magic.cpp
index f0fd47bea7829..e64921c4aadc4 100644
--- a/src/magic.cpp
+++ b/src/magic.cpp
@@ -1343,6 +1343,12 @@ float spell::spell_fail( const Character &guy ) const
     if( has_flag( spell_flag::NO_FAIL ) ) {
         return 0.0f;
     }
+    if( type->magic_type.has_value() &&
+        type->magic_type.value()->failure_chance_formula_id.has_value() ) {
+        const_dialogue d( get_const_talker_for( guy ), nullptr );
+        return type->magic_type.value()->failure_chance_formula_id.value()->eval( d );
+    }
+
     const bool is_psi = has_flag( spell_flag::PSIONIC );
 
     // formula is based on the following:
diff --git a/src/magic_type.cpp b/src/magic_type.cpp
index 4d95b6330257f..a001d9feade03 100644
--- a/src/magic_type.cpp
+++ b/src/magic_type.cpp
@@ -44,6 +44,7 @@ void magic_type::load( const JsonObject &jo, const std::string_view src )
                   id.c_str() );
     }
     optional( jo, was_loaded, "casting_xp_formula_id", casting_xp_formula_id );
+    optional( jo, was_loaded, "failure_chance_formula_id", failure_chance_formula_id );
     optional( jo, was_loaded, "energy_source", energy_source );
     if( jo.has_array( "cannot_cast_flags" ) ) {
         for( auto &cannot_cast_flag : jo.get_string_array( "cannot_cast_flags" ) ) {
@@ -80,6 +81,7 @@ void magic_type::serialize( JsonOut &json ) const
     json.member( "get_level_formula_id", get_level_formula_id );
     json.member( "exp_for_level_formula_id", exp_for_level_formula_id );
     json.member( "casting_xp_formula_id", casting_xp_formula_id );
+    json.member( "failure_chance_formula_id", failure_chance_formula_id );
     json.member( "energy_source", energy_source );
     json.member( "cannot_cast_flags", cannot_cast_flags, std::set<std::string> {} );
     json.member( "cannot_cast_message", cannot_cast_message );
@@ -106,6 +108,10 @@ void magic_type::check_consistency()
         if( m_t.casting_xp_formula_id.has_value() && m_t.casting_xp_formula_id.value()->num_params != 0 ) {
             debugmsg( "ERROR: %s casting_xp_formula_id has params that != 0!", m_t.id.c_str() );
         }
+        if( m_t.failure_chance_formula_id.has_value() &&
+            m_t.failure_chance_formula_id.value()->num_params != 0 ) {
+            debugmsg( "ERROR: %s failure_chance_formula_id has params that != 0!", m_t.id.c_str() );
+        }
     }
 }
 
diff --git a/src/magic_type.h b/src/magic_type.h
index 02b7280b5880e..bff85b5caee00 100644
--- a/src/magic_type.h
+++ b/src/magic_type.h
@@ -45,6 +45,7 @@ class magic_type
         std::optional<jmath_func_id> exp_for_level_formula_id;
 
         std::optional<jmath_func_id> casting_xp_formula_id;
+        std::optional<jmath_func_id> failure_chance_formula_id;
         std::optional<magic_energy_type> energy_source;
         std::set<std::string> cannot_cast_flags; // string flags
         std::optional<std::string> cannot_cast_message;
diff --git a/src/npc.cpp b/src/npc.cpp
index e6c8ec8768a5c..ad5c32765a3ff 100644
--- a/src/npc.cpp
+++ b/src/npc.cpp
@@ -3976,3 +3976,5 @@ std::unique_ptr<talker> get_talker_for( npc *guy )
 {
     return std::make_unique<talker_npc>( guy );
 }
+
+