Cane of Unravelling Build

Trying this new staff with Essence Drain, the only skill that seems to make sense with it. I was thinking for a chain (soon as I can afford a 5-link) to go Essence Drain > Added Chaos Damage > Void Manipulation > Spell Echo > Arcane Surge.

I think the Inya's Epiphany Arcanist Slippers will go good with it so I can max out my power charges faster. The staff adds 2 levels to socketed chaos gems so I looked up all the supports with the chaos tag, here is what I found:

Added Chaos Damage Support
Poison Support
Void Manipulation Support
Lesser Poison Support
Decay Support

What I'm not sure of is if different sources of chaos damage will stack or simply overlap. If you added a Lesser Poison Support to Essence Drain, would they only be lapping each other? I know the poison will stack but since you already have Essence Drain doing chaos damage, will the poison damage be redundant until you build up enough stacks to bypass the Essence Drain damage? Same thing with Decay Support, will the chaos damage inflicted by it do nothing since there is already chaos damage there?

By the way, why does spell check tell me unravelling is spelled with one l? I'm pretty sure it's two.

Thanks, I thought of another question.

I am not sure what parts of the damage my critical strike is affecting.

I found this in Wiki:
https://pathofexile.gamepedia.com/Critical_strike
"Critical strike multipliers do not affect the critical strike multiplier on ailments, including global critical strike modifiers. Ailments have a base 150% multiplier when applied by a critical strike. The only way to increase the critical strike multiplier on ailments is with the Perfect Agony keystone."

So the spell critical strike multiplier for ailments will be stuck at 150% unless I learn the Perfect Agony keystone. I also assume Essence Drain is broken down into three parts; chaos damage per ball(looks like a sperm), chaos damage over time, and poison damage. And these three damages add together while casting.

When I learn critical strike in the skill tree such as Annihilation, what parts of the damage is it affecting? My assumption is this:

Chaos damage per ball.
Critical strike chance: Yes
Critical strike multiplier: Yes

Chaos damage per second.
Critical strike chance: Yes
Critical strike multiplier: Yes

Poison damage per second.
Critical strike chance: Yes
Critical strike multiplier: No

I have no idea where the poison is coming from. I have no poison in my tree or inside my gear, does poison come with Essence Drain? If the critical strike mods are only ignoring the poison damage critical strike multiplier then it's fine because it's a very little part of my damage

"

Vipermagi wrote:

ED's Hit Damage scales with Crit as per the norm.
Damage over Time cannot Crit, and as such will not benefit from Crit Mult.
Derivative DoTs (Poison, Bleed, Ignite) scale with "Damage multiplier for ailments from Critical Strikes" - the Perfect Agony keystone allows this Damage multiplier to scale with Crit Mult. Derivate DoTs Crit if the main Hit lands a Crit.

The character sheet always displays Poison/Bleed, even if you cannot currently apply either.

What about the DoTs from Essence Drain? It is not a Poison, Bleed, or Ignite. Essence Drain also has a note "Modifiers to spell damage apply to this skill's damage over time effect." By the wording it should mean when I take the skill point Annihilation from the tree, the crits should also apply to it's damage over time. Or is it not? Every time I take a critical strike skill node will my damage over time stay the same? So are crits only buffing the hits?

I guess what it comes down to is are you supposed to use Perfect Agony with this staff? The staff has power charge mods on it telling me you are supposed to do a critical strike build with it. But it wouldn't make any sense if you are only scaling a fraction of the damage with crits. There is no way to tell for sure because the character sheet simply doesn't tell you what the damage over time for Essence Drain is doing.