New to this stuff I've been reading a site by Alcasthq on magicka dps sets. On there, under his description of the Mother's Sorrow set, he says "Most builds frontbar this set, you will loose the bonus once you swap to the backbar" and this has really confused me. How exactly are set bonuses linked to bars? Indeed, how does one Frontbar a set? I really don't know what it means.