Expensive anti zerg Necro. Expensive because every single set in this build requires reconstruction.

FOOD: Witchmother's Potent Brew
POTS: Alliance Spell Draught. Buy this from Cyrodiil merchs, keep around 30 at all times and don't go crazy buying this pots since they get obsolete every 5 levels.

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Avid Boneyard: This is what makes the bomb possible. You wanna pre-cast your Blastbones to do the combo, then use this skill to proc Dark Convergence and drop your Colossus ulti in there. You need to synergize yourself this skill and because your using harmony trait in all your jewelry it will deal a lot of damage. All you need to do is kill 1 player to proc Vicious Death and the chain reaction will be completed.

Stalking Blastbones: Keep this up at all times when facing enemies.

Elemental Weapon: Use this and then light attack from range with your staff.

Elemental Susceptibility: Use this at no cost to deal Major Breach and apply elemental status on your enemies.

Force Pulse: Use this in combination with Elemental Weapon and Elemental Susceptibility to deal damage to nearby enemies.

ULTI: Pestilent Colossus: Use it with your Boneyard + Dark Convergence.

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Summoner's Armor: Keep this up at all times, it will make 2 of your abilities cheaper.

Spirit Guardian: Keep this up at all times, it will heal you.

Race Against Time: This will keep you alive and gives the slow Necro a lot of speed.

Rapid Regeneration: Before you engage in combat try putting this on.

Resistant Flesh: Heal spammable, this is your S.O.S. when your HP is very low.

ULTI: Renewing Animation: For helping the team when they're dead. Also you'll get some resources back. You can change this ulti to Goliath if you're running solo.