1.5 Betrayers still works on a city that is "immune to magic"
The spell Betrayers still causes cities that are immune to magic (ex: levelled conclaves with the right ability) to "flip" sides even though they are immune to magic.
Lost a conclave to the spell "Broken Loyalties", despite it having a Tower of the Magi with:
<GameModifier>
<ModType>City</ModType>
<Attribute>ProtectFromSpells</Attribute>
</GameModifier>