ok bet

code/__DEFINES/combat/block.dm

@@ -20,6 +20,8 @@
 #define BLOCK_TARGET_DODGED				(1<<7)
 /// Meta-flag for run_block/do_run_block : By default, BLOCK_SUCCESS tells do_run_block() to assume the attack is completely blocked and not continue the block chain. If this is present, it will continue to check other items in the chain rather than stopping.
 #define BLOCK_CONTINUE_CHAIN			(1<<8)
+/// Attack should change the amount of damage incurred. This means something calling run_block() has to handle it!
+#define BLOCK_CHANGE_DAMAGE				(1<<9)
 
 /// For keys in associative list/block_return as we don't want to saturate our (somewhat) limited flags.
 #define BLOCK_RETURN_REDIRECT_METHOD			"REDIRECT_METHOD"
@@ -39,6 +41,12 @@
 #define BLOCK_RETURN_NORMAL_BLOCK_CHANCE						"normal_block_chance"
 /// Tells the caller about how many hits we can soak on average before our blocking fails.
 #define BLOCK_RETURN_BLOCK_CAPACITY								"block_capacity"
+/// Tells the caller we got blocked by active directional block.
+#define BLOCK_RETURN_ACTIVE_BLOCK								"active_block"
+/// Tells the caller our damage mitigation for their attack.
+#define BLOCK_RETURN_ACTIVE_BLOCK_DAMAGE_MITIGATED				"damage_mitigated"
+/// For [BLOCK_CHANGE_DAMAGE]. Set damage to this.
+#define BLOCK_RETURN_SET_DAMAGE_TO								"set_damage_to"
 
 /// Default if the above isn't set in the list.
 #define DEFAULT_REDIRECT_METHOD_PROJECTILE REDIRECT_METHOD_DEFLECT

code/__DEFINES/movespeed_modification.dm

@@ -78,4 +78,6 @@
 #define MOVESPEED_ID_COLD                               "COLD"
 #define MOVESPEED_ID_HUNGRY                             "HUNGRY"
 #define MOVESPEED_ID_DAMAGE_SLOWDOWN                    "DAMAGE"
-#define MOVESPEED_ID_DAMAGE_SLOWDOWN_FLYING				"FLYING"
+#define MOVESPEED_ID_DAMAGE_SLOWDOWN_FLYING				"FLYING"
+
+#define MOVESPEED_ID_ACTIVE_BLOCK						"ACTIVE_BLOCK"

code/__DEFINES/traits.dm

@@ -278,3 +278,7 @@
 #define CLOWNOP_TRAIT "clown-op"
 #define MEGAFAUNA_TRAIT "megafauna"
 #define DEATHSQUAD_TRAIT "deathsquad"
+/// This trait is added by the active directional block system.
+#define ACTIVE_BLOCK_TRAIT				"active_block"
+/// This trait is added by the parry system.
+#define ACTIVE_PARRY_TRAIT				"active_parry"