/**
@fn obj::perm_exp
@section Use
<table>
	<tr>
		<th>Type(s)</th>
		<th>Description</th>
	</tr>	<tr>
		<td>
@ref page_type_43
		</td><td>    &lt;Permanent experience&gt; is the experience the player gained
    permanently. Even if a player dies multiple times or gets drained, his
    &lt;experience&gt; will not fall below &lt;permanent experience&gt;.</td>
	</tr>

*/