I was looking through the xml for the diplomacy techs that spawn recruitable monster lairs, and saw this...
<GameModifier>
<ModType>Player</ModType>
<Attribute>UpdateRecruitables</Attribute>
<StrVal>DRAGONS</StrVal>
<Value>0</Value>
</GameModifier>
What does this block of code do? I though that they would spawn a monster lair, but that does not seem to be the case.