I went tank Reaper for the Beta. Being as how much of my time was spent in shroud during raids, I needed something that was relatively quick and only used so I could build up LF and get back into shroud. “Your soul is mine” was great for a little top off and a boost to LF, although I can see other heals being better in situation where you are not a tank. As an added bonus anytime a water field was placed and I pressed one of the three spin to wins a necro has I just shot cleansing bolts in all directions, greatly reducing the amount of condi clearing anyone needed. YAAW adding might and stab to tank were super critical since I was in another party by myself with the added bonus of having not party buffs. “Nothing can save you” is great for unblockable crits which seem to happen 5000% of the time while in shroud. Placing a few traits into MM is great with “Rise” giving you longer lasting minions that mitigate 50% damage. It was very rare for all of my horrors to die before being able to use the shout again which causes nearly 100% uptime of 50% damage mitigated. Being as how I didn’t want a crap golem running around, or to be in lich form/ plague form for any of the fight, because 5000% crits, I used “Chilled to the Bone” giving me more stab and just adding another cc for the red orbs and a breaker bar fun time with the boss. After casting all of those in quick spam succession and not in that order, I maximized shroud uptime, which maximized crits and damage mitigation. In fractals where I swapped up gear and wasn’t required to tank, I settled for some of the other utilities that condi cleared or helped out somewhat in whatever fractal happened to be up.
Tank build (may be changed due to number swapping by anet, also be aware that I made the whole raid be under 1600 toughness, which worked out great for those wanting to be more damage orient i.e. Berserker/ Sinister):
http://gw2skills.net/editor/?vREQNBHhFUomGYvxC1gJFAKZps4PYJsFSVCqBXKA-TRSBABUcKFC4AFonWGLV/JRdBXt/QXK/WUJIAPBASBYuOL-e
DPS Build (this was my “fractal” build, swap out the shouts for anything that the fractal needs):
http://gw2skills.net/editor/?vREQNBHhFUomGYvxyvgFnEfiXRqnwXIYBl0CAfAA-TBSBABUcKFC4AFon+GLV/5q9HwS53iKBB4JAQKgI2ZB-e
Side note: I know that there is no precision causing me to have like -5000% crit in normal form…but with the crits of shroud being what they were I decided to have a highly survivable necro in any situation and just stack the hell out of ferocity because when I started seeing crits of 20k or higher I thought I broke necro since that isn’t normal for us. Go with the flow and stack what stats are best for you but for a super survival, high dps necro with a royal crap ton of crit…why not.