--- a/nagslang/game_object.py	Fri Sep 06 15:54:43 2013 +0200
+++ b/nagslang/game_object.py	Fri Sep 06 16:13:43 2013 +0200
@@ -480,3 +480,46 @@
         if self.lifetime > 0.1:
             self.physicser.remove_from_space()
             self.remove = True
+
+
+class HostileTerrain(GameObject):
+    zorder = ZORDER_FLOOR
+    damage = None
+    tile = None
+    # How often to hit the player
+    rate = 5
+
+    def __init__(self, space, position, outline):
+        body = make_body(10, pymunk.inf, position)
+        # Adjust shape relative to position
+        shape_outline = [(p[0] - position[0], p[1] - position[1]) for
+                         p in outline]
+        self.shape = pymunk.Poly(body, shape_outline)
+        self._ticks = 0
+        self.shape.collision_type = COLLISION_TYPE_SWITCH
+        self.shape.sensor = True
+        super(HostileTerrain, self).__init__(
+            SingleShapePhysicser(space, self.shape),
+            render.TiledRenderer(outline,
+                                 resources.get_image('tiles', self.tile)))
+
+    def collide_with_protagonist(self, protagonist):
+        # We're called every frame we're colliding, so
+        # There are timing issues with stepping on and
+        # off terrian, but as long as the rate is reasonably
+        # low, they shouldn't impact gameplay
+        if self._ticks == 0:
+            protagonist.lose_health(self.damage)
+        self._ticks += 1
+        if self._ticks > self.rate:
+            self._ticks = 0
+
+    @classmethod
+    def requires(cls):
+        return [("name", "string"), ("position", "coordinates"),
+                ("outline", "polygon")]
+
+
+class AcidFloor(HostileTerrain):
+    damage = 1
+    tile = 'acid.png'