document 6xB4x4B command

src/CommandFormats.hh

@@ -5399,14 +5399,28 @@ struct G_Unknown_GC_Ep3_6xB4x4A {
   parray<le_uint16_t, 8> card_refs;
 } __packed__;
 
-// 6xB4x4B: Unknown
-// TODO: Document this from Episode 3 client/server disassembly
+// 6xB4x4B: Set EX result values
+// This command specifies how much EX the player should get based on the
+// difference between their level and the levels of the players they defeated or
+// were defeated by. (For multi-player opponent teams, the average of the
+// opponents' levels is used.) The game scans the appropriate list for the entry
+// whose threshold is less than or equal to than the level difference, and
+// returns the corresponding value. For example, if the first two entries in the
+// win list are [20, 40] and [10, 30], and the player defeats an opponent who is
+// 15 levels above the player's level, the player will get 30 EX when they win
+// the battle. If all thresholds are greater than the level difference, the last
+// entry's value is used.
 
-struct G_Unknown_GC_Ep3_6xB4x4B {
-  G_CardBattleCommandHeader header = {0xB4, sizeof(G_Unknown_GC_Ep3_6xB4x4B) / 4, 0, 0x4B, 0, 0, 0};
-  // If any of the entries [0][1] through [0][10] or [1][1] through [1][10] are
-  // < -99 or > 99, the entire command is ignored.
-  parray<parray<le_int16_t, 20>, 2> unknown_a1;
+struct G_SetEXResultValues_GC_Ep3_6xB4x4B {
+  G_CardBattleCommandHeader header = {0xB4, sizeof(G_SetEXResultValues_GC_Ep3_6xB4x4B) / 4, 0, 0x4B, 0, 0, 0};
+  struct Entry {
+    le_int16_t threshold;
+    le_int16_t value;
+  } __packed__;
+  // If any of the entries in either list has .value outside the range [-100,
+  // 100], the entire command is ignored and default values are used instead.
+  parray<Entry, 10> win_entries;
+  parray<Entry, 10> lose_entries;
 } __packed__;
 
 // 6xB4x4C: Update action chain

src/Episode3/DeckState.cc

@@ -27,8 +27,8 @@ void DeckEntry::clear() {
   this->team_id = 0xFFFFFFFF;
   this->god_whim_flag = 3;
   this->unused1 = 0;
-  this->unused2 = 0;
-  this->unused3 = 0;
+  this->player_level = 0;
+  this->unused2.clear(0);
   this->card_ids.clear(0xFFFF);
 }
 

src/Episode3/DeckState.hh

@@ -31,8 +31,8 @@ struct DeckEntry {
   // always sets this to 3, and it's not clear why this even exists.
   uint8_t god_whim_flag;
   uint8_t unused1;
-  le_uint16_t unused2;
-  be_uint16_t unused3;
+  le_uint16_t player_level;
+  parray<uint8_t, 2> unused2;
 
   DeckEntry();
   void clear();