feat: HLD: deceleration ring

data/des/des-main.des

@@ -753,3 +753,10 @@ glowing.
 
 
 $cDuration:$. This effect lasts for $bwillpower$. turns.
+
+% deceleration
+$cEffect:$. Erects an invisible shield around you, causing attacks against you
+to take twice as long.
+
+
+$cDuration:$. This effect lasts for $bwillpower * 2$. turns.

data/prefabs/HLD_s_deceleration.fab

@@ -0,0 +1,27 @@
+:g_subroom
+:priority 50
+:notraps
+% Allow stairs, guards, items
+
+% TODO: which Leqhyebundib? My notebook isn't with me right now, I can't recall
+% the first name of the steward one (or was that not a Leqhyebundib?)
+
+@p P
+Another strange relic found locked in Leqhyebundib's vaults. As it bears some
+superficial similarities to the Earthen Shield's ring, it's being kept here for
+eventual examination by the High Priest as well.
+
+$g-- Zilodothrod Hubsel, Captain of the Guard$.
+END POSTER
+
+@0 p gold_c_wall_pltfrm
+@1 p gold_c_wall_left
+@2 p gold_c_wall_upper
+@3 p gold_c_wall_lower
+@4 p gold_c_wall_right
+@5 p gold_c_wall_block
+@r i =deceleration
+
+.p.
+0r0
+124

src/items.zig

@@ -249,6 +249,7 @@ pub const ALL_ITEMS = [_]ItemTemplate{
     .{ .w = 0, .i = .{ .X = &Earthen1ShieldAux } },
     .{ .w = 0, .i = .{ .X = &Earthen2ShieldAux } },
     .{ .w = 0, .i = .{ .r = DisintegrationRing } },
+    .{ .w = 0, .i = .{ .r = DecelerationRing } },
 };
 
 pub const Key = struct {
@@ -1157,6 +1158,22 @@ pub const ObscurationRing = Ring{ // {{{
     }.f,
 }; // }}}
 
+pub const DecelerationRing = Ring{ // {{{
+    .name = "deceleration",
+    .required_MP = 2,
+    .effect = struct {
+        pub fn f() bool {
+            const will = @intCast(usize, state.player.stat(.Willpower));
+            const duration = math.max(1, will) * 2;
+            state.player.addStatus(.RingDeceleration, 0, .{ .Tmp = duration });
+
+            state.message(.Info, "An invisible shield begins to surround you.", .{});
+
+            return true;
+        }
+    }.f,
+}; // }}}
+
 pub const ExcisionRing = Ring{ // {{{
     .name = "excision",
     .required_MP = 5,

src/types.zig

@@ -1175,6 +1175,7 @@ pub const Status = enum {
     RingDeception, // No power field
     RingConcentration, // No power field
     RingObscuration,
+    RingDeceleration,
 
     // Item-specific effects.
     DetectHeat, // Doesn't have a power field.
@@ -3249,7 +3250,8 @@ pub const Mob = struct { // {{{
             if (weapon.reach < attacker.distance(recipient))
                 continue;
 
-            if (weapon.delay > longest_delay) longest_delay = weapon.delay;
+            if (weapon.delay > longest_delay)
+                longest_delay = weapon.delay;
             _fightWithWeapon(attacker, recipient, weapon, opts, if (weapon.martial) martial else 0);
         }
 
@@ -3258,6 +3260,9 @@ pub const Mob = struct { // {{{
 
         if (!opts.free_attack) {
             const d = attacker.coordMT(recipient.coord).closestDirectionTo(recipient.coord, state.mapgeometry);
+            if (recipient.hasStatus(.RingDeceleration)) {
+                longest_delay *= 2;
+            }
             attacker.declareAction(.{ .Attack = .{ .who = recipient, .coord = recipient.coord, .direction = d, .delay = longest_delay } });
         }