Campaign of 30 missions: six against the rival masters Mossgrim and Lady Nightwell, islands, mana springs, sealed caves with chained creatures

- missions interleaved into one story (EN/DE), new epilogue, map sizes grow to 176x176
- islands in water or lava with treasure and/or a mana spring; rivers at least four tiles wide
- sealed caves with treasure and a chained creature that joins once the cave is claimed
- new goals: rival cores, mana springs, freed creatures
- rival messages name the masters; new progress key for the new mission order

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/props.rs

@@ -97,10 +97,32 @@ pub fn draw_props_solid(g: &Game, cam: &Cam, t: f32) {
                 Kind::Temple if (x + z) % 2 == 0 && h % 3 == 0 => candle_stand(c + vec3(((h >> 4) % 5) as f32 * 0.1 - 0.2, 0.0, ((h >> 8) % 5) as f32 * 0.1 - 0.2), l),
                 Kind::Library if z % 2 == 0 => shelf(c, h, l),
                 Kind::Library if h % 3 == 0 => lectern(c, l),
+                Kind::ManaSpring => spring_basin(c, l),
                 _ => {}
             }
         }
     }
+    // creatures in chains: an iron post with chains to the creature
+    for e in g.ents.iter().filter(|e| e.alive && e.chained) {
+        if (e.x as i32) < x0 || (e.x as i32) > x1 || (e.y as i32) < z0 || (e.y as i32) > z1 {
+            continue;
+        }
+        let post = vec3(e.x.floor() + 0.5, 0.0, e.y.floor() + 0.15);
+        cube(post + vec3(0.0, 0.35, 0.0), vec3(0.08, 0.7, 0.08), rgb(70, 70, 78, 0.6));
+        for n in 0..6 {
+            let f = n as f32 / 6.0;
+            let side = if n % 2 == 0 { 0.08 } else { -0.08 };
+            let p = post.lerp(vec3(e.x + side, 0.25, e.y), f) + vec3(0.0, 0.3 * (1.0 - f) + 0.05 * (f * 3.14).sin(), 0.0);
+            cube(p, vec3(0.05, 0.05, 0.05), rgb(120, 120, 130, 0.6));
+        }
+    }
+}
+
+// a stone basin around a mana spring
+fn spring_basin(c: Vec3, l: f32) {
+    for (dx, dz, sx, sz) in [(0.0, -0.38, 0.8, 0.1), (0.0, 0.38, 0.8, 0.1), (-0.38, 0.0, 0.1, 0.8), (0.38, 0.0, 0.1, 0.8)] {
+        cube(c + vec3(dx, 0.08, dz), vec3(sx, 0.16, sz), rgb(90, 95, 110, l));
+    }
 }
 
 pub fn draw_props_glow(g: &Game, cam: &Cam, t: f32) {
@@ -161,6 +183,17 @@ pub fn draw_props_glow(g: &Game, cam: &Cam, t: f32) {
                         }
                     }
                 }
+                Kind::ManaSpring => {
+                    // rising mana: a pulsing pool and motes that drift up
+                    let f = 0.8 + 0.2 * (t * 2.0 + k).sin();
+                    draw_cube(c + vec3(0.0, 0.1, 0.0), vec3(0.66, 0.04, 0.66), None, Color::new(0.3, 0.8, 1.0, 0.85 * f));
+                    for n in 0..5 {
+                        let a = n as f32 * 1.26 + k;
+                        let y = ((t * 0.5 + n as f32 * 0.2) % 1.0) * 1.2;
+                        draw_sphere(c + vec3(a.cos() * 0.2, 0.15 + y, a.sin() * 0.2), 0.05 * (1.2 - y), None, Color::new(0.5, 0.9, 1.0, 0.9));
+                    }
+                    draw_sphere(c + vec3(0.0, 0.4, 0.0), 0.3 * f, None, Color::new(0.3, 0.7, 1.0, 0.15));
+                }
                 Kind::Lair if tile.bed != 0 => {
                     // the flame priestess sleeps on embers
                     if let Some(EK::Priestess) = u.beds.get(&tile.bed) {