Nothing like an explanation to all.
Spawns a portal on death with a probability
portal (string): name of dungeon portal
probability (double, default 1): chance at which the portal will drop
timeout (int, default 0): time it takes for portal to despawn (in ms, 0 means it'll never timeout)
<Behavior portal="The Shatters Portal" probability=".25" timeout="120">DropPortalOnDeath</Behavior>