POE : Over Time again.

new understanding : DoTs stack! up to 20.
so
Blight - Fast Cast - Ctrl Dest - Void Mani - Rapid Decay --- Conc. Effect
Contagion - Ctrl Dest - Void Mani - Rapid Decay
CWDT - Inc Dura - Immortal Call
Blasphemy - Temporal Chain - Enfeeble --- Vulnerability
Stone Golem

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Spell Totem - Wither - Faster Cast -- AOE
7% x 20 stacks = 140% inc Chaos damage taken

Blight - CWC - Contagion - Desecrate - Essence Drain - Void Manipulation - Rapid Decay

Blight L20 - 167/s --- spell - chaos - dot - area damage
Contagion L20 - 189/s --- spell - chaos - dot - area
Desecrate L20 - 294/s --- spell damage - dot - chaos damage - area damage
Essence Drain L20 - 809/s --- spell - chaos - dot
Void Manipulation L20 - 39% More Chaos Damage
Rapid Decay L20 - 39% More DoT Damage

SO, CHAOS and DOT, and AREA

Blasphemy - Vulnerability [ 33% DoT damage ] - Temporal Chain

ASCENDANCY IS....OCCULTIST
Tree

Helpful Uniques :
Carcass Jack
Singularity
Breath of the Council

on second thought...since after casting 0.45sec you can cast all skills, why not have 2 sets of cwc?

Blight - CWC - Vortex - Cold Snap? - Ice Nova?