Well 1... We don't need a chest piece for 2 grenades so that titan piece is worthless 2nd we have the grenade and fire spam known as heart of praxic fire which EVEN FURTHER decreases your already about 1 second cool downs + viking funeral so grenades set enemies on fire.. With the longer radiance perk I can throw 14-18 fusion grenades at a boss and destroy in pve. It also gives us more heavy ammo and more fusion rifle ammo. Then there's obsidian mind. Nova bomb kills grant super energy and it has inverse shadow. Throw in bad juju and you'll get more supers than you can ever use. Think that blows all your armor out the water. Did I mention voidfang + gift of the sun + fusion grenades does quite nice on crucible?