OK, here's an update.
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First, gear.
Quote (Dr_Lecter @ 17 Aug 2021 14:25)
Phoenix shield might be alright for sustain but it doesn't do a lot for your other skills. Spirit would probably be the better all rounder, especially for the fcr which you're going to need.
I agree that FCR is going to be an issue. On the other hand, you cannot deny the power of lowering the resistances, especially if you break an immunity, whether it be LR or Conviction.
Say you have a monster which is 50% fire resistant; if your spell does damage d, the foe will take 0.5*d, but with Phoenix that becomes 0.78*d. That's more than 50% more! At reasonably high spell levels, this is much more damage dealt than a +2 to skills, EVEN combiend with both Eschuta's and Ormus.
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As far as armor, hard to go wrong with vipermagi until you find what works with the rest of the gear.
Yep, when I reach level 29, Vipermagi it is. I also have Viscerataunt which I'll probably use until I hit nightmare, and then switch back to Ancient's Pledge (I am obsessed with resistances, probably too much so :p).
Speaking of resistances...
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Stat points and skills.
As to stat points, since the start it has been 2 str, 2 vit, 1 nrg per level. I am still unsure what strength I should target since my goal is of course to wear a monarch (just like Spirit, Phoenix requires it). As to vit, well, since at first I don't plan on using Spirit on the shield, I'll have poor FHR at best (another perk to my resistance obsession...) therefore I want as much HP as I can muster. Currently, my line of thought is that once I'm satistfied with the mana I have (and strength) I'll invest all the rest into vitality.
Skills:
* Fire: one point in Warmth and that's it. I have decided NOT to use Meteor but exclusively Fireball, the only synergy I will exploit is therefore Firebolt. The reason is that Meteor requires another 3 point investment but points are quite precious. Plus, Fireball has a reasonable radius anyway and it has no cooldown.
* Cold: one point in Frozen Armor (was that a mistake?). My plan is still to go with Frozen Orb. At my level I use Blizzard, and I have a really hard time targeting with it. Sometimes I target on a particular foe and it gets no damage? Uh. Nah. Not for me.
* Lightning: I have decided to go wiht Chain Lightning. Yes, I know, FCR problems yada yada, but I think I can hit 78% comfortably -- I'll see whether I'll go (and need) 105. Nova requires getting a little too close to enemies for my (and my merc's) comfort

Also, that obligatory point into Teleport and one into that equally obligatory Static Field.
Summarizing planned skill points so far, without exploiting synergies:
* Fire: 1 (warmth) + 21 (Fireball + prereq) + 1 (mastery) is 23.
* Cold: 1 (armor) + 25 (Orb + prereq) + 1 (mastery) is 27.
* Lightning: 1 (Static Field) + 2 tTeleport) + 22 (Chain Lightning) + 1 (mastery) is 26.
Total: 76.
Note: I know that this is NOT optimal. At one point, in order to increase a spell with synergies, it is more interesting to invest alternatively into the synergy then the spell (by my calculations for instance, when FB reaches level 12 hard, it is more interesting to then invest a point into Firebolt). I have to find an online calculator which I'm pretty sure exists and has done all the calculations.