Lightning Arrow carries six tags: Attack, AoE, Projectile, Lightning, Chaining and Repeatable. It sits in level band 1 with a green attribute, which means a Ranger can equip it at character level 1 and keep it for the whole game.
The build’s ceiling is set by two much smaller numbers, though. Only 19 skill gems in the entire table carry both Lightning and Projectile, and only 6 support gems carry the Chaining tag. Chaining is the mechanic the skill is named around in its own description, and it has the thinnest support pool of any tag this build touches.
This guide plans a Lightning Arrow character from those numbers: the Bow cutting ladder, the 19-gem lightning projectile pool, the 33 lightning supports by band, and the six chaining gems that decide whether the build clears.
The Bow cutting ladder
| Tier | Bow gems in the pool | Count |
|---|---|---|
| 1 | Lightning Arrow, Escape Shot, Poisonburst Arrow, Lightning Rod | 4 |
| 3 | Freezing Salvo, Stormcaller Arrow, Snipe, Vine Arrow | 4 |
| 5 | Ice-Tipped Arrows, Barrage, Toxic Growth, Electrocuting Arrow | 4 |
| 7 | Gas Arrow, Voltaic Mark, Freezing Mark, Sniper’s Mark | 4 |
| 9 | Ice Shot, Detonating Arrow, Rain of Arrows | 3 |
| 11 | Shockchain Arrow, Tornado Shot | 2 |
| 13 | Magnetic Salvo, Spiral Volley, Toxic Domain | 3 |
Bow totals 24 gems, the same as Occult and Elemental. The tier 1 pool is unusually generous for this archetype: Lightning Arrow and Lightning Rod are both in it, so a single tier 1 Bow cut has a two-in-four chance of producing a lightning skill.
Note what happens at tier 11: the pool drops to two, and both are lightning-adjacent in different ways — Shockchain Arrow carries Lightning and Chaining, Tornado Shot carries Physical and Wind. A lightning build cutting tier 11 has a coin flip between its own archetype and something else entirely.
Tier 13 is safer. Magnetic Salvo is a lightning projectile, Spiral Volley is physical, Toxic Domain is chaos — one in three.
The 19 lightning projectiles
The Lightning tag covers 67 skill gems; the Projectile tag covers 90. Their intersection is 19:
| Band | Lightning + Projectile gems |
|---|---|
| 1 | Lightning Arrow, Lightning Rod, Spark, Elemental Expression, Falling Thunder, Fulminating Concoction |
| 3 | Lightning Spear, Stormcaller Arrow |
| 5 | Arc, Galvanic Shards, Storm Lance, Electrocuting Arrow |
| 7 | Voltaic Grenade |
| 9 | Stormblast Bolts |
| 11 | Shockchain Arrow, Shockburst Rounds, Ball Lightning, Plasma Blast |
| 13 | Magnetic Salvo |
Read the bands carefully and the shape of a lightning build becomes clear. Six of the 19 are available at band 1 — a genuinely deep opening. Then band 5 adds four more, and the pool barely grows after that: four entries at band 11, one at 13.
That is the opposite of the Cold pool, where the highest-value spells sit at band 11 and 13. Lightning front-loads its options, which is why lightning builds tend to be settled early and then refined rather than rebuilt.
It also means the level 1 decision matters disproportionately. Lightning Arrow (Attack, Chaining) and Spark (Spell, no Chaining) are both band 1 lightning projectiles with completely different support requirements. Picking one locks out half the 33 lightning supports, because Attack supports and Spell supports do not overlap.
The 33 lightning supports, by band
| Band | Lightning supports | Count |
|---|---|---|
| 1 | Shock, Innervate, Stormchain, Coursing Current, Lightning Attunement, Thrill of the Kill, Shock Siphon, Shock Conduction II and 5 more | 13 |
| 2 | Lightning Penetration, Electrocute, Crackling Barrier, Lasting Shock, Volt, Shock Conduction, Living Lightning, Empowered Sparks I | 8 |
| 3 | Electromagnetism, Elemental Discharge, Neural Overload, Static Shocks, Stormfire, Thrill of the Kill II | 6 |
| 4 | Lightning Exposure, Overcharge, Living Lightning II, Empowered Sparks II | 4 |
| 5 | Lightning Mastery, Catalysing Elements | 2 |
By colour the pool is 19 blue, 12 green, 2 uncoloured. Lightning Arrow is a green gem, so the 12 green lightning supports are the ones a pure-dexterity setup can use without stretching attributes — a third of the pool, not the whole thing.
The band curve is steeply front-loaded: 13 of 33 in band 1, and only 2 in band 5. For a build that gets its second socket at gem level 1 and its third at gem level 10 (character level 36), that is convenient — most of what you want is available before the sockets are.
Six chaining supports
Chaining is the rarest tag the build touches. The complete list:
| Support | Band | Colour |
|---|---|---|
| Chain I | 1 | Green |
| Chain II | 2 | Green |
| Chain III | 5 | Green |
| Coursing Current | 1 | Blue |
| Dominus’ Grasp | 1 | Green |
| Stormchain | 1 | Green |
Five of the six are green, and four are band 1. The Chain line runs I, II, III across bands 1, 2 and 5 — so a green character can take the whole line and end at rank III, but only has the sockets for one rank at a time.
For comparison: AoE has 66 supports, Projectile has 58, Attack has 108. Chaining has six. If your build’s identity is “arrows chain”, you are working with the smallest support family in the game, and the practical consequence is that you should treat Chain as a single high-value slot rather than a stack.
The skill’s own description makes the mechanic the centre of the design:
“Lightning Arrow — Fire a charged arrow at the target. On hitting an enemy or wall, the arrow will fire Chaining Lightning beams at nearby enemies.” — poe2db.tw skill gem entry, cached in
src/data/poe2-skill-gems.json
Note “on hitting an enemy or wall”. The chain is conditional on a hit, which is why a support that adds projectiles or improves hit reliability is often worth more than a second chain source.
Sockets, in the order they arrive
Gem level 1 (character 1): 2 sockets. Lightning Arrow plus one support. With 13 band-1 lightning supports and 4 band-1 chaining supports, the choice is real but the budget is one.
Gem level 10 (character 36): 3 sockets. The rank II Chain support becomes legal at band 2, and the third socket is the first point where the build has both a damage support and a chaining support.
Gem level 15 (character 64): 4 sockets. Now Chain III at band 5 is reachable in the same setup as two other supports.
Gem level 20 (character 90): 5 sockets. The full setup.
Because 13 of the 33 lightning supports are band 1, the build does not need to wait for anything to come online. It needs sockets. That is a different problem from a cold build, which waits on band 11 and 13 spells.
A build order that follows the tags
Level 1: take Lightning Arrow and one green support. It is a band 1 gem in the tier 1 Bow pool, and it is an Attack, so Attack supports (108 of them) apply alongside Projectile supports (58).
Level 10 to 22: add Chain I. Band 1, green, and the single highest-leverage slot for a chaining skill. Then replace it with Chain II at band 2 when the third socket opens.
Level 36: decide on a Shock package. Shock, Innervate and Lightning Attunement are all band 1 blue — usable only if your attribute spread reaches blue. Lightning Penetration at band 2 is the alternative for a character that stays green.
Level 52: tier 13 access. Gem level 13 needs character level 52 and opens Magnetic Salvo in the Bow pool. It is the only lightning projectile above band 11 in the bow line.
Level 64: four sockets. This is where Chain III, a lightning penetration support and a projectile support can coexist.
Level 90: five sockets. The final configuration. By this point the limit is Socket pressure, not gem availability.
Ranger themes, and the ranged assumption
The class table gives the Ranger three themes: Long Range, Agility and Crowd Control. The first two describe Lightning Arrow exactly. The third is where the build’s weakness sits — crowd control implies slowing or freezing, and Lightning Arrow’s tags are Lightning and Chaining, not Cold.
That is why the 19-gem lightning projectile pool includes several skills with duration or sustained tags (Lightning Rod, Stormcaller Arrow, Electrocuting Arrow) rather than control effects. A pure Lightning Arrow setup clears by chaining, not by stopping anything.
For the surrounding systems, the support gems guide breaks down all 557 supports by tag and colour, the uncut gems guide explains the 20-level ladder behind the socket counts, and the skill gems database lists every Lightning and Projectile entry.
The Ranger class guide covers the class themes in full, the ascension guide covers the level 22 gate, and the crossbow build is the other lightning archetype if you prefer ammunition to arrows.