Here's a nasty spike build I've been messing around with. It deals a substantial AoE spike if executed correctly:

12 + 1 + 1 Channeling
12 + 1 Spawning Power
Usage is fairly straightforward. Use GoLE followed by DwG, position Destruction (best behind a minion wall or allied spirits) and wait 5-6 seconds. Then start the combo with A-Rage on Destruction, followed by Rupture Soul. Party support or dropping DwG should finish stragglers. Obviously you'll want to be in a position with as little interruption as possible.
Spirit Rift is in there to mix things up by adding more damage + Cracked Armor. However, Weaken Armor from a friendly Necro would also work. Suggested optional skills are Splinter/GDW, Spirit Boon Strike to heal Destruction if need be, or better yet, Summon Spirits to safely transport Destruction into the fray. Swap GoLE for Spirit Siphon and throw in another spirit, such as Vampirism, for another way to manage energy.
A point of interest in DwG: it will not trigger additional damage from Destruction or A-Rage, but will work nicely with Rupture Soul.
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The new Ritual Lord allows us to maintain defensive spirits for a long time. I haven't fully tested this yet, but this seems a very efficient way to mitigate damage:

12 + 1 + 1 Communing
12 + 1 Spawning Power
Pretty straightforward here. Dulled Weapon is added to give the spirits a tiny bit of breathing room.
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So, any other fun combinations to mess with?