TbXie's Detonate Dead Ignite Elementalist Pantheons, Ascendancy & Bandits (PoE Necropolis 3.24)
Ascendancy (Witch – Elementalist)
Shaper of Flames
This is what makes all of your damage ignite. And since we’re an Ignite build, I assume it speaks for itself we need to pick this up as soon as possible.
Mastermind of Discord
Because you should be applying exposure throughout the campaign (either through an already equipped Cluster or Wave of Conviction or whatever source of exposure you choose to use) this is a huge boost of Damage. Its mana regeneration also feels particularly useful whilst progressing the campaign.
Heart of Destruction
This notable kind of screams Detonate Dead all over it. It gives you some nice coverage whilst not fighting bosses and provides you with an absolute ludicrous amount of damage whilst fighting them.
Bastion of Elements
Often underestimated, Bastion of Elements provides you with a huge defensive buffer versus Elemental Damage. You take this last, because it relies on your allocated Notables, making it only better as you gain levels.
Bandits
This build doesn’t need anything from the Bandit options, so you should kill all. Oak is just too weak to warrant the two skill points and Alira and Kraityn don’t do anything for us. Two skill points from Eramir it is!
Pantheons
Major God
This is a bit flexible. I really like Solaris when bossing & Lunaris while mapping. Ideally, you swap those around in my opinion.
Minor God
I personally always pick up Soul of Abberath here and upgrade it to be immune to burning ground cause burning ground is super obnoxious to deal with.
Upgrading your Pantheons
Pantheon powers can be upgraded by using Divine Vessel in the Map Device while you are activating the particular Map that contains the boss you need. Once you’ve killed the boss and captured his soul, you can consume the Divine Vessel, which show up filled in the map device, or deliver it to Sin in Oriath for extra dialogue relating to the game’s lore.