feat: Add core rules

books/core/112.html

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+<h1>DANGER CLOCKS</h1>
+
+<p>The Game Master can use Clocks to keep track of incoming threats in the dungeon. These Danger Clocks should feature a number of section based on the urgency of the threat they represent:</p>
+
+<ul>
+    <li><strong>Eight sections</strong> for a threat that isn't immediately obvious and will only come true with time — something like "crumbling temple" or "magitech system failure".</li>
+    <li><strong>Six sections</strong> for a threat that is quite obvious and likely to happen after a while — such as "wandering monsters" or "poisonous fog".</li>
+    <li><strong>Four sections</strong> for a threat that is urgent and very likely to happen — something like "surrounded" or "high alert" in a dungeon brimming with hostile creatures.</li>
+</ul>
+
+<p>The Game Master may fill a Danger Clock as a consequence of failed Checks, as well as when an event would make the threat more likely, such as when the PCs spend time searching a room, make noise, rest inside the dungeon or draw unwanted attention.</p>
+
+<p>Different Danger Clocks will be triggered by different actions and events, of course — casting a spell might fill an "arcane overload" Clock, while searching a room is unlikely to affect it.</p>
+
+<p>As the Clock fills, the Game Master should foreshadow the incoming danger: once it is completely filled, that threat will become active in full, and the heroes will be forced to deal with it one way or another.</p>
+
+<p>Philip Forlenza (Order #)</p>