Mjollnir

The cleanest way to understand Mjollnir is to separate its two jobs and look at them independently, because it is genuinely doing two completely different things with one item slot.

The Chain Lightning passive is an attack speed and DPS item. At 90 attack speed, it is one of the highest raw attack speed bonuses in the game at that cost, and the 25% Chain Lightning proc adds an average of 45 magical damage to every attack against a lone target—180 damage spread across up to 12 bounces when enemies are clustered together. Against illusion lineups, the math gets absurd: Chain Lightning deals a full 180 damage to each illusion it touches, and illusions melt under that math because they have low health and no resistance scaling. The proc pierces evasion, so every Chain Lightning bounce connects regardless of Butterfly or blur. As a pure farming and DPS item in team fights against grouped enemies, Mjollnir is excellent.

The Static Charge ability is something categorically different—a reactive AoE damage shield that punishes anyone who attacks the bearer. Cast it on yourself, your carry, your initiator walking into the enemy team, a lane creep pushing a tower, or a Roshan tank. For 15 seconds, every time that unit takes damage, there is a 25% chance a 225-magical-damage bolt fires out and hits the attacker plus 4 surrounding enemies within 900 units. Against teams with multiple heroes fighting in close proximity—illusion lineups especially, where the attacker is surrounded by their own copies—Static Charge procs devastatingly fast and repeatedly, limited only by its one-second internal cooldown. The potential output is 1125 damage per trigger across five targets, every second, for 15 seconds. The number is theoretical, but the threat is constant and real.

These two functions combine to make Mjollnir uniquely valuable against specific lineups—illusion carries, high attack speed carries, and teams that group tightly in fights—while being a competent damage item in every other situation through the Chain Lightning alone.

The third or fourth item on agility carries and attack-speed-dependent cores—Faceless Void, Juggernaut, Razor, Arc Warden, Sniper, and Lina—is an upgrade from Maelstrom. The timing is 25 to 35 minutes, when you have already established a farming and damage foundation and need to push the DPS ceiling further.

The draft signal that makes Mjollnir specifically better than alternatives is illusion-heavy enemy lineups. Phantom Lancer, Naga Siren, Chaos Knight, Terrorblade—against these heroes, Maelstrom is already good, and Mjollnir is great. The Chain Lightning's 180 damage hits each illusion independently, and since those illusions are often in a tight cluster, a single proc can cascade through a swarm. Combine that with Static Charge placed on the carry being dived by a wall of illusions, and the active is firing constantly, dealing 225 damage to five targets every second the illusions attack.

Where you skip Mjollnir and take something else: against single-target assassin lineups where no one is bunched together, Chain Lightning's multi-bounce value drops to just the 45 average damage against one target, and Static Charge gets fewer proc opportunities when only one or two enemies are in range. Against those lineups, Butterfly, MKB, Desolator, or Silver Edge solve specific problems more efficiently than generalist AoE lightning does. Mjolnir is a lineup-dependent item—when the enemy is clustered and numerous, it shines. Against isolated single-target threats, there is usually something sharper for the price.