With madurai's sling strength (double void "sling" for 40% str) ability it is possible to gain maximum gloom slow cap (95%) with combination of molt vigor and [Energy Conversion] while using [Overextended] and [Power Donation] (best aura in the game). Molt efficiency adds juicy duration which ease energy consumption for gloom.
Strategy:
- Get energy orb
- Double void sling
- Cast gloom
2.1 Get some kills and recast
Replacement
Replace [Continuity] for blood altar or [Blending Talons]. Duration is mostly used for utility and less energy consumption for gloom.