Level 95 Raise Spectre Necromancer^3.26

Notes

Trade Search for cheap rings for early medium swap below. Remove the ring requirement once you have your rings and find an amulet as well. 
https://www.pathofexile.com/trade/search/Mercenaries/w5JKOvPib

2x cheap rings and 1x cheap amulet is absurdly effective. As we're using an amulet, which are all dirt cheap, you can use cheaper rings if you want early on and upgrade later. 

It's important that you understand that if you have 5 divines total, spending 4 of them on setting up Doryani is NOT the play.
You need a functional build for Doryani to scale *from*. I'll elaborate a bit.

If you have a loadout like, for instance:
Decent wand, +2, some minion damge + trigger
Decent shield, +1 and some crit
+2 helmet with craft on it
Some half-decent ghastly eyes with at least #% inc if recently
And a level 20 ish mages gem (pref with quality ofc)
That's a great time for Doryani

If you have a loadout like, for instance:
Bad wand, +0, some minion damage
Random shield, no +, no crit
+1 helmet, no craft
Bad jewels
That's a time to upgrade these things first, and then look at Doryani after you finish previous steps.
You don't quite need as much as the above list, but this is more to give you a rough idea. Hitting 25 total levels on the mages is big, very big.