Rune Arm

Rune Arm (or Arm Cannon) is new kind of equipment implemented with Update 11 and the Artificer class. It goes into secondary weapon/off hand slot and requires Artificer Rune Arm Use feat (Artificer level 2 class feat) to use.

Rune Arms can be used in the offhand (with crossbow). The Rune arm has unique magical properties such as: adding magical weapon damage to the main hand, magical enhancements, and being craftable (CAUTION: adding crafting enhancements raises the minimum level requirement significantly).

The Rune Arm also functions as a weapon as a free action (not restricting the users abilty to cast or attack). The weapon uses Charges with five tiers, and these charges increase in damage the higher the tier (Rune Arms have a max tier level). Charges can be added standing still or while moving limited by the "Stable Charge Tier".

Rune Arms are currently only acquired by finishing certain quest chains, or in certain chests already known for dropping named and/or rare loot, such as the three dragon chests in Gianthold Tor; there are currently no randomly generated Rune Arms. The complete list of known Rune Arms, as well as their location, are below.

How it works

 * Can be worn together with 1 handed weapons and crossbows (not bows)
 * Tapping the Alt button will start charging it up, tapping it again fires it.
 * You can Toggle the Rune Arm Use feat on while on an actionbar to make it keep autocharging.
 * Damage will be affected by Artificer level and charge tier.
 * Rune Arms will give a bonus elemental damage to the weapon in your main hand.
 * Blocking with a charge reduces the charge to it's maximum stable tier.

List of named Rune Arms
As of Update 11, named Rune Arms have been added to almost all reward list across the game (Sharn Syndicate being the exception, which doesn't seem to award one) and to some other named loot/raid chest. Items are Bound to Account unless otherwise noted.

Max Charge Tier 2:
 * Candlelight - Catacombs
 * Chulchannad's Claw - Phiarlan Carnival
 * Flame Warden - The Lost Seekers
 * Flicker - The Seal of Shan-To-Kor
 * Khyber's Fury - Assault on Splinterskull
 * Thought Spike - Redemption in Korthos Island

Max Charge Tier 3:
 * Chimera's Breath - Sentinels of Stormreach
 * Coronach - Delera's Tomb
 * Hand of the Tombs - The Chamber of Raiyum (treasure chamber chest, BtC on equip)
 * Recoyle - Ruins of Threnal
 * The Devourer's Hunger - Cult of the Six
 * The Disciplinator - Vault of Night (raid chest, BtC)
 * The Pea Shooter - Into the Deep in The Red Fens
 * Trial by Fire - Attack on Stormreach

Max Charge Tier 4:
 * Arcing Sky - Gianthold Tor (Blue Dragon chest)
 * Chill of Winter - Gianthold Tor (White Dragon chest)
 * The Turmoil Within - Gianthold Tor (Black Dragon chest)
 * Titan's Fist - The Titan Awakes (raid chest, BtC)

Max Charge Tier 5:
 * Animus - Devil Assault on all difficulties (Unbound)
 * Glorious Obscenity - Reign of Madness
 * Lucid Dreams - The Mindsunder (Disc-locked end chest)
 * Tira's Splendor - Garamol (rare encounter in The Subterrane)
 * Toven's Hammer - The Master Artificer (raid chest, BtC)

Rune Arm crafting
One can add enhancements, via Cannith Crafting system, on a Rune Arm as if it was a trinket