The Mighty Necro Build
Use Carrion amulet.
If you use Carrion Amulet, you lose dhuumfire, so no.
I will never understand the infatuation with stacking a ton of vitality on a class that is already on the highest base HP pool with another life bar on top of it as well as multiple ways to deal with conditions. Some bonus vitality is good but not enough to take priority over other stats.
As for the build, maybe swap two Lyssa runes in for a little extra duration on your conditions. Only lose 4 sec on battle sigil might stacks and even less on BiP. With all the extra power from might stacks DS1 and 4 will hit pretty hard with the high crit chance.
(Jade Quarry) Team Savvy
If you use Carrion Amulet, you lose dhuumfire, so no.
http://wiki.guildwars2.com/wiki/Furious_Demise
Along with having close to roughly 2800 power and 17% base crit without any crit sigils or crit runes.
Dhuumfire is a 100% proc on a 10s cooldown, you don’t really need a lot of crit to use it effectively, especially with the Furious Demise trait taken.
That aside, if you go 30 points in Spite you get a decent amount of power; stacking more on top of that from Carrion makes your direct damage be noticeable, especially considering that might increases not only your condition damage, but also your power.
So IMO if you make a might-oriented build on a necro with 30 points in Spite, it won’t be a pure condition build but more of a hybrid and I’d say you’re taking advantage of it better with carrion than with rabid in terms of dps output. Survivability-wise you will see a lot of people telling you that the difference between carrion and rabid is marginal and usually in favor of carrion, mainly due to how vitality scales on necros and how DS scales with it.