Help with Necromancer..

I'm not sure whether to post this in build or not.. but it isn't exactly about what skills I should get and stuff.. so I'll post it here .

I'm a N/E, Minion master with some nuking spells.. I heard a lot about how Death Nova is so great and all that but I have a problem.. when I have about 10 minions or so, I have trouble clicking on the guy thats being attacked and casting death nova on him.. is there a way where I can press something and it'll target 1 of my minions?

Also.. where can I get Vereta's Sacrifice (mm.. part of the "exploration" for this forum rite?)... really need that

all 3 Vereta's skills are at copperhammer mines.

ooh... thats like.. really near the end lol.. oh well, thanks for the info!