In Path of Exile, Spectre based summoners plow through nasty maps and bosses with minimal investment. Defense is easy to scale, and offense scales with the level of your spectres, the number of links you can provide them, and to a lesser extent your gear. Bear in mind that having enough poe orbs is not bad for you.
Equip a Stone of Lazhwar and an Advancing Fortress, and watch your block and spell block max out when using Bone Offering. Something still hits you? 10k EHP soaks up all but the most devastating one-shot mechanics. Need a cheap 6-link? A Tabula Rasa can take you all the way to Shaper.
Path of Exile 3.1 build focuses on two types of spectres that benefit from all of the same support gems:
Tukohama’s Vanguards cast a tanky Scorching Ray totem that deals massive damage if the burning gets to stack up. The Totems also lower the fire resist of their targets by -1% per burn application, down to -24%. This stacks with the -50% fire resist from Elemental Equilibrium.
While the resistance penalty from the Tukohama’s Vanguards’ totems will not exceed -24%, regardless of the number of totems, each individual totem will contribute a separate damage over time system. So the more totems, the more damage.
Wicker Men are giant bears that use Righteous Fire to deal AoE damage to everything around them. Their RF auras do not stack, but they provide nice AoE coverage for clear speed. They are nice for clearing out the trash mobs so the Vanguards can focus on the tanky stuff. They were balnced in 3.1, but are still relevant in this setup.
In addition, using Animate Guardian wielding 2 x Dyadus Axes, which will make enemies take 200% more burning damage when chilled. Dyadus also has the effect of chilling enemies for 1 second, or 2.5 seconds with the Icetomb chest piece.