There are a lot of combinations you can go with for devotions. Devotions help you buffer what you need while you wait to pick up equipment. You can choose devotions for increasing damage (via all damage or lightning/electrocution damage) as listed. Or you can use devotions to fill in the survival gaps for resistances, life, etc. Or you can mix a little of both until you find things.
Once you build reputation with the factions and get access to augments you’ll find you can substitute a lot of resistances that way on all your gear types from various faction augments even at honored, with more at revered. Especially useful for the hard to find ones, like aether & chaos.
Also, take a look at vendor items like Kymon’s Chosen. A lot of their gear has lightning damage built in, plus resistances, high armor, etc. You want to stack up high armor, resistances, life and as much lightning/electrocution damage as you can.
Components can also be added to either increase lightning damage, or resistances, or buffer anything else. So you can add a component & an augment to each item to help scale things out.
If you get high enough resistances, you can focus on devotions for damage.
The beauty is you can re-spec at any time, so you can start one way, finish another.
Another option is to completely transform the build from lightning to vitality damage as you have that option too. Then look at devotions that enhance vitality damage for example. Lots of options! That comes from the Corruption transmuter to Storm Totem and push Blood Pact. You can then also get some interesting life leach going on too that helps with survival.
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Being new to the game and facing Ultimate, the only thing that is different is resistances. As long as you’re comparable level to your foe, it’s not a big deal. But truly the biggest difference is having high resistances with the penalty. Everything hurts a lot more when you’re in the negative. So ultimate is about stacking resistances so that you survive first, and then build in some damage from there. This particular build is pretty safe because you don’t need specific gear, just stuff with lightning damage and resistances. Stack it all together as you find it (most come from vendors, craft, etc). I found that in Ultimate when my damage on my Totem hit around 4~5k, Ultimate was a breeze for clearing speed. So I just made sure my resistances were as high as possible. There’s no secret to Ultimate. If you played normal/elite, Ultimate is the same, just with even more penalties to resistances. Everything else should be scaling with it on its own per your character level and your items should also be slowly replaced to higher level from higher level vendors/factions. The last thing is just dealing enough damage, because they too have high resistances.
Very best,
