Because of this combination of skills / perks
[u]Arcane spirt +divine order[/u] : this combination gives you 80-90% of the bar filled in both armor and recovery( reduses agility to about 15-20%
[u]energy drain[/u]: normally only reduses your grenade cool down but is augmented by other abilities.
[u]Embrace the void[/u]: where it starts to get fun. Damaging enemy's with your grenade / nova bomb triggers energy drain
[u]life steal[/u] killing a enemy while energy drain is active restores a " significant portion " if your health.
[u]the hunger [/u] extends the duration of energy drain
With these abilities you should be able to tank very well
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Toss this into your build: http://www.destinydb.com/items/2771018500-skull-of-dire-ahamkara#zsXXVS8 1.) Its a skull... that has to look cool. 2.) It buffs your defense during Nova Bomb. 3.) Improves all siphon abilites. 4.) Other synergy with defense/grenade.