feat: add ring of deception

data/des/des-main.des

@@ -645,7 +645,7 @@ the sword will attack multiple foes in a line in that direction while giving
 them the $oheld$. status.
 
 
-The lifespan of the spectral sword is equivalent to your willpower * 2, and its
+The lifespan of the spectral sword is equivalent to your $bwillpower * 2$., and its
 damage is equivalent to $btriple$. the damage your current weapon would deal if
 you attacked (defaulting to $b1$. damage if you don't have a weapon).
 
@@ -697,3 +697,11 @@ damage, $r§$. == $b100%$. damage). Damage will never be below 1.
 $cEffect:$. Confers $aimmobility$., $aexplosiveness$., $anoisy$., and $b3$.
 turns of $alifespan$. on a foe, thus causing it to explode (radius $b2$.) after
 $b3$. turns. Will-checked.
+
+% deception
+$cEffect:$. While under the ring's effect, undead without nearby non-undead
+allies will be deceived into thinking you are an ally. The ring cannot be used
+while corrupted. The effect is not will-checked.
+
+
+$cDuration:$. Ring duration lasts for $bwillpower$. turns.

data/des/des-statuses-nonplayer.des

@@ -16,6 +16,9 @@ This is supposed to be a player-only status, and is probably a bug.
 % nonplayer_Status.RingAcceleration
 This is supposed to be a player-only status, and is probably a bug.
 
+% nonplayer_Status.RingDeception
+This is supposed to be a player-only status, and is probably a bug.
+
 % nonplayer_Status.DetectHeat
 This is supposed to be a player-only status, and is probably a bug.
 

data/des/des-statuses-player.des

@@ -16,6 +16,9 @@ Refer to the ring's description.
 % player_Status.RingAcceleration
 Refer to the ring's description.
 
+% player_Status.RingDeception
+Refer to the ring's description.
+
 % player_Status.DetectHeat
 You are detecting sources of heat, as well as enemies attuned to fire.
 

data/status_help.tsv

@@ -1,12 +1,13 @@
 # vim: nowrap
 #
 # status                status name              status name (unliving)  mini name
-.RingTeleportation 	"ring: teleportation" 	 -                     	 -
-.RingDamnation     	"ring: damnation"     	 -                     	 -
-.RingElectrocution 	"ring: electrocution" 	 -                     	 -
-.RingExcision      	"ring: excision"      	 -                     	 -
-.RingConjuration   	"ring: conjuration"   	 -                     	 -
-.RingAcceleration  	"ring: acceleration"  	 -                     	 -
+.RingTeleportation 	"ring: teleportation" 	 "dancing"             	 -
+.RingDamnation     	"ring: damnation"     	 "whistling"           	 -
+.RingElectrocution 	"ring: electrocution" 	 "jumping around"      	 -
+.RingExcision      	"ring: excision"      	 "pontificating"       	 -
+.RingConjuration   	"ring: conjuration"   	 "house of pain"       	 -
+.RingAcceleration  	"ring: acceleration"  	 "is in effect"        	 -
+.RingDeception     	"ring: deception"     	 "voting for trump"    	 -
 .DetectHeat        	"detect heat"         	 -                     	 -
 .DetectElec        	"detect electricity"  	 -                     	 -
 .EtherealShield    	"ethereal shield"     	 -                     	 -

src/ai.zig

@@ -412,6 +412,10 @@ pub fn checkForHostiles(mob: *Mob) void {
         return;
     }
 
+    const has_nonundead_ally = for (mob.allies.items) |ally| {
+        if (ally.life_type != .Undead) break true;
+    } else false;
+
     for (mob.fov) |row, y| for (row) |cell, x| {
         if (cell == 0) continue;
         const fitem = Coord.new2(mob.coord.z, x, y);
@@ -425,7 +429,8 @@ pub fn checkForHostiles(mob: *Mob) void {
 
             if (!othermob.ai.flag(.IgnoredByEnemies) and
                 mob.isHostileTo(othermob) and
-                (!mob.ai.flag(.IgnoresEnemiesUnknownToLeader) or mob.squad.?.leader.?.cansee(othermob.coord)))
+                (!mob.ai.flag(.IgnoresEnemiesUnknownToLeader) or mob.squad.?.leader.?.cansee(othermob.coord)) and
+                !(othermob.hasStatus(.RingDeception) and !has_nonundead_ally))
             {
                 updateEnemyRecord(mob, .{
                     .mob = othermob,
@@ -460,6 +465,7 @@ pub fn checkForHostiles(mob: *Mob) void {
             enemy.mob.ai.flag(.IgnoredByEnemies) or
             (mob.ai.flag(.IgnoresEnemiesUnknownToLeader) and
             !mob.squad.?.leader.?.cansee(enemy.mob.coord)) or
+            (enemy.mob.hasStatus(.RingDeception) and !has_nonundead_ally) or
             enemy.mob.is_dead)
         {
             alert.reportThreat(mob, .{ .Specific = enemy.mob }, confrontation);

src/items.zig

@@ -211,6 +211,7 @@ pub const RINGS = [_]ItemTemplate{
     .{ .w = 9, .i = .{ .r = AccelerationRing } },
     .{ .w = 9, .i = .{ .r = TransformationRing } },
     .{ .w = 9, .i = .{ .r = DetonationRing } },
+    .{ .w = 9, .i = .{ .r = DeceptionRing } },
 };
 pub const NIGHT_RINGS = [_]ItemTemplate{
     .{ .w = 9, .i = .{ .r = ExcisionRing } },
@@ -963,6 +964,28 @@ pub const DetonationRing = Ring{ // {{{
     }.f,
 }; // }}}
 
+pub const DeceptionRing = Ring{ // {{{
+    .name = "deception",
+    .required_MP = 2,
+    .stats = .{ .Willpower = 1 },
+    .effect = struct {
+        pub fn f() bool {
+            if (state.player.hasStatus(.Corruption)) {
+                state.message(.Info, "You cannot use this ring whilst corrupted.", .{});
+                return false;
+            }
+
+            const will = @intCast(usize, state.player.stat(.Willpower));
+            const duration = math.max(1, will);
+            state.player.addStatus(.RingDeception, 0, .{ .Tmp = duration });
+
+            state.message(.Info, "A strange aura begins to surround you.", .{});
+
+            return true;
+        }
+    }.f,
+}; // }}}
+
 pub const ExcisionRing = Ring{ // {{{
     .name = "excision",
     .required_MP = 5,

src/types.zig

@@ -1128,6 +1128,7 @@ pub const Status = enum {
     RingExcision, // No power field
     RingConjuration, // No power field
     RingAcceleration, // No power field
+    RingDeception, // No power field
 
     // Item-specific effects.
     DetectHeat, // Doesn't have a power field.