Okay.<br/><br/>Here's some info, then.<br/><br/>Evocation Focus Items can be divided up by three sets of criteria.<br/><br/>The first is element.  The standard 5 elements are Air, Earth, Fire, Water, and Spirit/Force.  A bonus can only be applied to a single element per slot.  So, to boost both Spirit and Fire would cover two slots.<br/><br/>The second is offense/defense.  Again, same thing.  You have to pick either one for for Focus Slot.<br/><br/>The last is power/control, which works the same as offense/defense.<br/><br/>Put these three together, and you have a single Focus Item Slot.<br/><br/>Now, you said that for your combat magic, you think precision is more important than power.  That means that you want control, over power.  Now, here's the other questions to ask you.  Do you prefer more control for attacks, or for defenses?  Second, what element(s) do you want better control over?  Keep in mind, you have two free slots.  You can do a few things.  You can either put all your slots into one category, or you can split them up.  You can have either a +2 in one category (like offensive fire control), or a +1 in two categories (like offensive fire control, and defensive spirit control.)<br/><br/><br/>Okay.  Moving on to Thaumaturgy.  It sounds like your Focus Item Slot will either provide a bonus to Divination (Tracking) or Warding (defense).  So, your Focus Item Slot for Thaumaturgy will either provide a +1 to Divination, or a +1 to Wards.  Simple as that.