With the shards and mats from the CRift you can gamble Bracers of the First man with level 1. Those give you up to +500% damage on Hammer of the Ancients, which is insane. You couldn't wear those bracers until level 16, BUT you can get cube right away and extract that legendary power. With this you'll have a 500% multiplier the whole time while leveling as soon as the HotA-skill is unlocked (at level 2!) and don't have to wear those level 16 bracers all the way up to level 70.