Originally Posted by
Blastyswa
I personally have a first life deep gnome wizard with no tomes at level 30. With 55 Spell Penetration, and 70-80 necro DC, I'm currently able to lead kills in LE Tempest's Spine/HoX, LH Shroud, and most every quest, assuming no one who's just flat out better than me at insta-kills is in the party, especially since I have to debuff a little bit. With u32, I would gain +4 spell penetration, and at least +5 DC from a 5 piece set.
Despite all that, I'm still TRing the character a few times to pick up 3x deep gnome, 3x wizard, and 3x favored soul past lives (Which, by the way, are the only ones you really need to worry about as a DC caster, with the possible exclusion of completionist and epic past lives), and that's not just because I want to be effective in LE Shroud, the only raid I currently can't contribute in. The reason is that, without past lives, you have to sacrifice A LOT from other categories to bump up that spell penetration in particular; +4 spell pen orb from u32, 3 twists towards spell penetration, Gauntlets of the Arcane Soldier, all become necessary if you want to make up for that spell penetration difference. So I wouldn't necessarily say that DC caster's aren't workable without past lives, it's just that they perform much better when you can unload a lot of that spell penetration boosting onto a passive benefit like past lives instead of something with opportunity cost like multiple twists and items.