Mursilis said:
I've only made one Necromancer but I'd personally go with Decrepify as it slows the monster down as well as allow you to deal more damage. It's not quite as good as Amplify against mobs and such, but that's what Corpse Explosion is for anyway.
As for the assassin, I was going to go the CoS route. I have no idea how it will work so I can't really answer your question. Only to say with CoS, bosses will be extremely hard, but since you're up against packs mostly you'll need the CoS to get to the bosses in the first place.
I'll add my deliberations why I chose decrepify.
I was choosing between a few curses: Amplify Damage, Attract, Decrepify, and Dim Vision.(I think those are all I seriously considered)
Amplify Damage: gives a huge damage bonus, ideal for physical damage dealing skellies. It does not have any crowd control abilities, but it might by means of the damage increase prevent the need for crowd control.
Attract: good for crowd control, keeping your skellies alive for longer, but useless against bosses.
Decrepify: not as large a damage bonus as amplify damage, and some immunities might not be broken as a result. However, the slow effect is very useful, especially against bosses, which happened to be my main issues. The first three act bosses were okay, but Diablo and Baal and nightmare Andariel were not, nightmare Duriel I did at players1 because I was lacking decrepify. But I do see my survival chances as quite minimal against nightmare Diablo and Baal without decrepify, even at players 1.
Dim vision: the best anti-gloam curse, and in general a very good crowd control curse, but again useless against bosses. (of course for regular bosses you can use it to get rid of the minions)
In the end I concluded that solely because of act bosses decrepify is the better choice, however, I might come to regret it when I die to the first gloams I encounter in the Great Marsh.
As to the assassin, I also want some suggestions. Originally I was thinking of first obsessing in venom, shadow master, or blade fury, and the other two afterwards. However, since I cannot take a fourth obsession, this plan is off. I think I'll go with the shadow master, but I might instead take one of the buff skills. Anyway, I won't be using blade fury, instead taking another trap skill, probably death sentry, as last obsession. Neither will I take venom, since there isn't enough of a reason to take it when using it only with tiger strike and not with blade fury as well. The choice remains between shadow master, burst of speed, and fade, since I won't be able to equip any claws other than katars both claw mastery and weapon block are off. I even think I can scratch burst of speed from the above. I'm not considering cloak of shadows since the duration when maximized is more a hindrance than a boost, apart from it not being too effective against bosses. (especially act bosses)
So it comes down to: what should I take, shadow master or fade?
I'll also be introducing my other contestants shortly, after deciding on what their attribute, elemental, and first skill obsessions will be.