Because of these skills in the subclass tree
Arcane spirt( gives you armor and massive recovery )
Divine order ( gives you massive armor to match your recovery score )
Energy drain( used with next 2 skills )
embrace the void ( triggers energy drain on spur or grenade damage )
Life steal ( kills an enemy with energy drain restore a large portion of your health )
The hunger ( increases the duration of energy drain )
Soul rip( energy drain redused the cd of your super )
Seems pretty fun
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Also as it stands with this class they will also do massive dps because of more grenades and more supers