As the title already said I'm needing help understanding how to make the build like the guide says, i somehow need to get the full set bonus of bones of Rathma but i also need the full Captain Crimson's trimmings bonus for cd reduction i can get that with ring of royale grandeur but i also need to use fate's vow helm but if i use it i cant get the full Bones of Rathma set bonus or Captain Crimson's trimmings bonus. 
If anyone know how i can get that build to work please say how, I'm open to any suggestions.
Link to the guide I'm  talking about: https://www.icy-veins.com/d3/necromancer-rathma-army-of-the-dead-build
(this is my first post on icy-veins and i don't fully understand if I'm doing this right) 

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Heyas all! Just a short video paying homage to all the Protection Paladins out there, Much Love!
 
 

I am going the corpselance support build for Necromancer and the build has me taking Corpselance with Brittle and the pestilence set on top of that, if I were to take off the ability Corpselance and change it to another ability say for example Bone Spikes with Frost spikes, would the damage decrease an amount that it would not be worth it?

Enter Eclipse Apply or maintain your Moonfire, Sunfire, and Stellar Flare (if talented) Keep Celestial Alignment / Incarnation: Chosen of Elune (if talented) on cooldown Cast Convoke the Spirits when you have less than 50 Astral Power. Try to pair with your other cooldowns but do not lose a use. Spend your Astral Power on Starsurge or Starfall on multi-target. Do not lose uses of Warrior of Elune, Force of Nature, or Fury of Elune (if talented). Cast the Eclipse-appropriate filler. Item 3 says to cast Celestial Alignment as a higher priority than (presumably that means before you cast) Convoke the Spirits.
The subsection on Convoke the Spirits Optimization says "Generally, you will play around your Convoke and not your Celestial Alignment, as you almost never want to cast Celestial Alignment without Convoke up as well."
I'm not quite understanding how I'm supposed to prioritize Celestial Alignment in my rotation but not generally cast Celestial Alignment without Convoke up.
Unless Convoke is a special sort of channel, if you actually managed to cast Celestial Alignment during Convoke, wouldn't it interrupt the channeling of Convoke?
If I am supposed to cast Convoke and then cast Celestial Alignment as it's channeling, shouldn't the rotation guide have those reversed?
I'm sorry to be a noodge about accuracy here, but either I'm badly misunderstanding what looks like fairly simple instructions or the two elements of the instructions are inconsistent with one another.