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<h1 id="life-arcs"><a class="header" href="#life-arcs">Life Arcs</a></h1>
<p>Characters grow and change. A timid apprentice becomes a confident master baker. A new employee finds their place in the team. Life arcs model these transformations as state machines discrete phases with conditions that trigger transitions between them.</p>
<h2 id="what-is-a-life-arc"><a class="header" href="#what-is-a-life-arc">What is a Life Arc?</a></h2>
<p>A life arc defines:</p>
<ul>
<li><strong>States</strong>: Distinct phases (e.g., “apprentice”, “journeyman”, “master”)</li>
<li><strong>Transitions</strong>: Conditions that move between states (e.g., “when skill &gt; 80, become master”)</li>
<li><strong>On-enter actions</strong>: Changes that happen when entering a state (e.g., set confidence to 0.9)</li>
</ul>
<h2 id="your-first-life-arc"><a class="header" href="#your-first-life-arc">Your First Life Arc</a></h2>
<pre><code class="language-storybook">life_arc BakerCareer {
state apprentice {
on enter {
Baker.skill_level: 0.2
Baker.confidence: 0.3
}
on skill_level &gt; 0.5 -&gt; journeyman
}
state journeyman {
on enter {
Baker.confidence: 0.6
}
on skill_level &gt; 0.8 -&gt; master
}
state master {
on enter {
Baker.confidence: 0.95
Baker.can_teach: true
}
}
}
</code></pre>
<p>Reading this as a story:</p>
<blockquote>
<p>The baker starts as an <strong>apprentice</strong> with low skill and confidence. When skill exceeds 0.5, they become a <strong>journeyman</strong> with improved confidence. When skill exceeds 0.8, they become a <strong>master</strong> who is confident and can teach others.</p>
</blockquote>
<h2 id="states"><a class="header" href="#states">States</a></h2>
<p>Each state represents a distinct phase. States contain:</p>
<ul>
<li><strong>on enter block</strong>: Field updates that happen when entering the state</li>
<li><strong>Transitions</strong>: Conditions that trigger moving to another state</li>
<li><strong>Prose blocks</strong>: Narrative descriptions</li>
</ul>
<pre><code class="language-storybook">state early_apprentice {
on enter {
Elena.skill_level: novice
Elena.confidence: timid
}
on recipes_mastered &gt; 5 -&gt; growing_apprentice
on quit_apprenticeship -&gt; former_apprentice
---narrative
Elena's hands shake as she measures flour. She checks the
recipe three times before adding each ingredient. Martha
patiently corrects her technique.
---
}
</code></pre>
<h2 id="transitions"><a class="header" href="#transitions">Transitions</a></h2>
<p>Transitions use expressions to decide when to change state:</p>
<pre><code class="language-storybook">// Simple conditions
on health &lt; 20 -&gt; fleeing
on quest_complete -&gt; celebrating
// Boolean fields
on is_hostile -&gt; combat
on not ready -&gt; waiting
// Equality checks
on status is active -&gt; active_state
on name is "Martha" -&gt; found_martha
// Complex conditions
on health &lt; 50 and enemy_count &gt; 3 -&gt; retreat
on (tired and hungry) or exhausted -&gt; resting
</code></pre>
<h3 id="transition-priority"><a class="header" href="#transition-priority">Transition Priority</a></h3>
<p>When multiple transitions could fire, the <strong>first one in declaration order</strong> wins:</p>
<pre><code class="language-storybook">state combat {
on health &lt; 10 -&gt; desperate // Checked first
on health &lt; 50 -&gt; defensive // Checked second
on surrounded -&gt; retreat // Checked third
}
</code></pre>
<p>If health is 5, only <code>desperate</code> triggers, even though <code>defensive</code> is also true.</p>
<h2 id="on-enter-actions"><a class="header" href="#on-enter-actions">On-Enter Actions</a></h2>
<p>The <code>on enter</code> block sets field values when entering a state. It runs exactly once per transition:</p>
<pre><code class="language-storybook">state master_baker {
on enter {
Elena.skill_level: master
Elena.confidence: commanding
Elena.can_teach: true
}
}
</code></pre>
<p>The syntax is <code>EntityName.field: value</code>. This updates the referenced characters field.</p>
<h2 id="elenas-complete-journey"><a class="header" href="#elenas-complete-journey">Elenas Complete Journey</a></h2>
<p>Here is a complete life arc tracking Elenas growth from apprentice to master:</p>
<pre><code class="language-storybook">life_arc ElenaCareer {
---description
Tracks Elena's professional and personal growth as she
progresses from nervous apprentice to confident master baker.
---
state early_apprentice {
on enter {
Elena.skill_level: novice
Elena.confidence: timid
}
on recipes_mastered &gt; 5 -&gt; growing_apprentice
---narrative
Elena's hands shake as she measures flour. She checks the
recipe three times before adding each ingredient. Martha
patiently corrects her technique.
---
}
state growing_apprentice {
on enter {
Elena.skill_level: beginner
Elena.confidence: uncertain
}
on recipes_mastered &gt; 15 -&gt; journeyman
---narrative
The shaking stops. Elena can make basic breads without
looking at the recipe. She still doubts herself but
Martha's encouragement is taking root.
---
}
state journeyman {
on enter {
Elena.skill_level: intermediate
Elena.confidence: growing
Elena.can_work_independently: true
}
on recipes_mastered &gt; 50 -&gt; master
---narrative
Elena runs the morning shift alone while Martha handles
special orders. Customers start asking for "Elena's rolls."
---
}
state master {
on enter {
Elena.skill_level: master
Elena.confidence: commanding
Elena.can_teach: true
}
---narrative
Master Baker Elena. She has earned it. The guild acknowledges
her mastery, and Martha beams with pride. Elena begins
mentoring her own apprentice.
---
}
}
</code></pre>
<h2 id="common-patterns"><a class="header" href="#common-patterns">Common Patterns</a></h2>
<h3 id="hub-and-spoke"><a class="header" href="#hub-and-spoke">Hub-and-Spoke</a></h3>
<p>A central idle state with branches to specialized states:</p>
<pre><code class="language-storybook">life_arc BakerBehavior {
state idle {
on customer_arrived -&gt; serving
on order_placed -&gt; baking
on delivery_arrived -&gt; receiving
}
state serving { on customer_served -&gt; idle }
state baking { on batch_complete -&gt; idle }
state receiving { on delivery_processed -&gt; idle }
}
</code></pre>
<h3 id="linear-progression"><a class="header" href="#linear-progression">Linear Progression</a></h3>
<p>States form a one-way sequence (quests, tutorials):</p>
<pre><code class="language-storybook">life_arc Tutorial {
state intro { on clicked_start -&gt; movement }
state movement { on moved_forward -&gt; combat }
state combat { on defeated_enemy -&gt; inventory }
state inventory { on opened_inventory -&gt; complete }
state complete {}
}
</code></pre>
<h3 id="cyclic-states"><a class="header" href="#cyclic-states">Cyclic States</a></h3>
<p>States form a loop (day/night, seasons, mood swings):</p>
<pre><code class="language-storybook">life_arc DayNightCycle {
state dawn { on hour &gt;= 8 -&gt; day }
state day { on hour &gt;= 18 -&gt; dusk }
state dusk { on hour &gt;= 20 -&gt; night }
state night { on hour &gt;= 6 -&gt; dawn }
}
</code></pre>
<h2 id="tips"><a class="header" href="#tips">Tips</a></h2>
<p><strong>Order transitions by urgency</strong>: Put the most critical conditions first, since the first true transition wins.</p>
<p><strong>Use descriptive state names</strong>: <code>waiting_for_customer</code> is clearer than <code>state1</code>.</p>
<p><strong>Add narrative prose blocks</strong>: They make life arcs readable as stories and serve as documentation.</p>
<p><strong>Avoid orphan states</strong>: Every state should be reachable from some other state (the compiler will warn you about unreachable states).</p>
<h2 id="what-you-have-learned"><a class="header" href="#what-you-have-learned">What You Have Learned</a></h2>
<p>Congratulations! You have completed the tutorial. You now know how to:</p>
<ul>
<li>Create characters with species, templates, and enums</li>
<li>Build behavior trees with selectors, sequences, and decorators</li>
<li>Add conditions and action parameters</li>
<li>Model relationships with perspectives</li>
<li>Define time-based schedules</li>
<li>Track character development with life arcs</li>
</ul>
<h2 id="where-to-go-next"><a class="header" href="#where-to-go-next">Where to Go Next</a></h2>
<ul>
<li><strong><a href="../reference/09-overview.html">Reference Guide</a></strong>: Complete syntax specifications</li>
<li><strong><a href="../advanced/20-patterns.html">Design Patterns</a></strong>: Common patterns and best practices</li>
<li><strong><a href="../examples/24-baker-family-complete.html">Examples Gallery</a></strong>: Full working examples to learn from</li>
</ul>
<hr />
<p><strong>Reference</strong>: For complete life arc syntax, see the <a href="../reference/13-life-arcs.html">Life Arcs Reference</a>.</p>
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