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Soul stacker (18 
) by anon
Get lots of souls with soul siphon and the extra echo procs help you get more souls. Weakening will help you stay alive too
Soul Siphon
Tier 3: (6 
)
9 souls
When you hit an enemy, gain a 10% chance to grant you a bunch of extra souls.
Weakening
Tier 3: (6 )
-40% reduced damage
Your attacks decrease the attack damage of all nearby enemies for five seconds
Echo
Tier 3: (6 )
3 sec. cooldown
Some of your attacks can be followed up by another attack in rapid succession.