hi, if you're looking for a good starter that you can scale, has good defenses and damage then you can play my build:
https://pastebin.com/mUuCqgar
I have started this in Ritual and cleared all content without troubles. In early stages of the build you need to anoint Mind Drinker to have a reliable source of mana, also invest more in mana recovery from flasks nodes on the tree.
Little bit of gameplay: https://www.youtube.com/watch?v=OcPcfquSZ5U
This was without Divine Flesh and with bugged Arcane Surge from Hiero where level 1 from ascendancy overrided lvl 20 from the gem. Also I will be running Skitterbots this time so I can get Snowstorm on a large cluster. I expect the build to fully clear whatever Ultimatum will bring in.
Let me know if you have any questions or decide to start with this build.
Cheers!