Exeta res em criatura.

[Douglasga03 0]

Como faço para essa criatura usar exeta res (challenge) instantaneamente após ser sumonada. Essa craitura tem um tempo de vida de 3 segundos.
 

<?xml version="1.0" encoding="UTF-8"?>
<monster name="Target" nameDescription="a target" race="undead" experience="320" speed="0" manacost="999999999">
	<health now="2000" max="2000"/>
	<look type="102" corpse="2253"/>
	<targetchange interval="5000" chance="8"/>
	<strategy attack="100" defense="0"/>
	<flags>
		<flag summonable="0"/>
		<flag attackable="1"/>
		<flag hostile="1"/>
		<flag illusionable="0"/>
		<flag convinceable="0"/>
		<flag pushable="1"/>
		<flag canpushitems="0"/>
		<flag canpushcreatures="0"/>
		<flag targetdistance="1"/>
		<flag staticattack="90"/>
		<flag runonhealth="0"/>
	</flags>
	<attacks>
		<attack name="energy" interval="500" chance="100" radius="3" target="0" min="0" max="0">
			<attribute key="areaEffect" value="yellowspark"/>
		</attack>
	</attacks>
	<defenses armor="0" defense="0"/>
	<immunities>
		<immunity physical="1"/>
		<immunity energy="1"/>
		<immunity fire="1"/>
		<immunity poison="1"/>
		<immunity ice="1"/>
		<immunity holy="1"/>
		<immunity death="1"/>
		<immunity lifedrain="1"/>
		<immunity manadrain="1"/>
		<immunity paralyze="1"/>
		<immunity drunk="1"/>
		<immunity outfit="1"/>
		<immunity invisible="1"/>
	</immunities>
</monster>