Revealed today, Path of Exile is finally going to complete the trilogy of elemental summons excluding Stone Golem & Chaos Golem but also including them, if you know what I mean. So, not a trilogy.
In Patch 2.2.2, the Summon Lightning Golem will be finally released. It will be a range summon similar to it’s elemental counterparts.
It will also use its own temporary aura skill, adding a small amount of extra lightning damage to nearby allies’ attacks and spells. While you have a Lightning Golem summoned, it’ll grant you increased attack and cast speed.