5 Violet Archon Shards with melee critical damage
Whipclaw range caps out at 200% ability range (10m), however I still build more to improve the range of 2 and 4. But swapping Augur Reach or Cunning Drift for mods suggested below (or any other you fancy) could benefit you, but this is a personal preference (for exilus Power Drift could help your Dispensary drop more pickups)
I would HIGHLY ADVISE using the Naramon focus school so you don't lose all your combo multiplier in case you need energy or there are no enemies nearby.