Titans are big powerful monsters that are perfect for fast destruction
of goblins and buildings.  You can have only one Titan at a time and can
only control them with direct control.  To make a Titan go to your hall
of Titans (located near the clanshrine most of the time times) and get
the Titan you want.  To make a clan follow a Titan, when in direct
control, hold down L1 and press that clan's button twice fast.  Best of
all Titans (with the exception of the stone ogre's eating times) can not
hurt your own goblins!