I thought more about this topic and raising energy regen on Oblivion relic would be good (like 5e/s). Giving some energy regen to Obsidian Juggernaut would be good as well and Occultist should as a class give more energy itself. I looked at all my builds with it and unless they are Warlock’s they have lower energy pool.
@tqFan has an aether Oblivion Apostate and in the guide he writes that in boss rooms energy regen is weaker as well. And with my builds the energy goes down in boss rooms even with Warlock.