Summary
The Arc Spell Totem Gemling Legionnaire is a one-button mapping powerhouse. You place totems, they cast Arc automatically, and keep moving while they clear everything around you. This build excels at high-end mapping, expeditions, and pinnacle bosses. While the current version is heavily invested, the basic framework can be started for much less. If you want to skip the early grind, you can buy POE2 Currency to speed up gearing. Either way, the build improves gradually as you add skill levels, Spirit, and mana scaling.
Core Mechanics
Reaching Six Totems
The path to six totems starts with the Spell Totem gem itself. At level 23, Spell Totem has a base limit of three totems. Taking Ancestral Bond on the passive tree doubles that limit to six . Ancestral Bond removes the mana cost for placing totems, but each totem reserves Spirit instead . With six totems active, the quality investment gives Arc more damage and makes every totem cast faster .
Quality Double-Dipping
The Gemling Legionnaire ascendancy is what makes this build shine. Advanced Thaumaturgy gives every skill an additional quality effect .
For Arc, this means more damage for each remaining chain. For Spell Totem, it grants increased cast speed per summoned totem. With six totems up, this provides substantial cast speed .
Dominus' Grasp doubles Arc's chain count . Arc begins with many more chains remaining, making the quality damage bonus much stronger, especially against the first target hit . This is the main gem link interaction.
Mana as Defense and Damage
Mana serves as both your defensive layer and your primary damage scaler.
Mind Over Matter makes all damage hit your mana before your life. As long as you have mana, incoming damage is taken from mana first . This is especially important because the build plays on low life—your life pool sits behind the mana pool .
Eldritch Battery converts energy shield from your items into maximum mana . Energy shield on helm, body armor, gloves, and boots all becomes part of your mana pool instead of staying separate.
Mana also provides damage scaling through passive tree nodes that grant spell damage per 100 maximum mana. Archmage adds extra lightning damage based on your mana pool, fitting naturally on top of the defensive setup .
Low Life Setup
Archmage normally reserves Spirit. By linking it with Zerphi's Communion, the reservation shifts from Spirit to life. This reserves enough life to keep the character on low life .
Once on low life, you gain access to:
Pain Attunement: 30% more critical damage bonus
Execute Tree support: extra damage while on low life, and more damage again when enemies reach low life
This works because Mind Over Matter makes all damage go through mana before life. Mana protects the small life pool while reserving life gives you massive damage boosts.
Gem Links
Main Setup: Spell Totem + Arc
The six-link setup:
Spell Totem - turns Arc into a totem skill
Arc - lightning chaining projectile
Dominus' Grasp - doubles chain count
Scion's Temper - fires extra projectiles in a circle for better coverage
Urgent Totems - increased placement speed
Execute Tree - more damage on low life
Utility Gems
Archmage + Zerphi's Communion - moves reservation to life, activates low life
Mana Remnants - main recovery tool; creates remnants on kill or crit that overflow mana
Charge Regulation - power charges give critical hit chance
Blasphemy + Temporal Chains - slows enemies around you
Purity of Ice - granted by scepter; helps resistance setup
Clarity, Vitality, Cannibalism - extra recovery; no Spirit cost due to Impurity skill
