As a rule of thumb, should you round up or down when using ACKS?
For example, your familiar counts as half your level. If I am a 3rd Level Mage and my familiar has Loremastery (which reduces the throw target number by 1 per level), does my familiar count as Level 1 or Level 2 for this purpose?

In general, you should round fractions of less than 1/2 down, and round fractions of 0.5 or greater up.
Your familiar would count as level 2 as (3/2=1.5).

Fantastic. Thanks!