Arms an artificial, close combat battle arm which fights like an additional weapon. Initiates a series of attacks with both the equipped weapon and the battle arm. This close combat arm cannot shoot. Battle Extension can do multiple hits (3-4) and can be modded to give a chance of producing even more. Also, Battle Extension gives a "passive" chance for double hits when in the active slot (but not being used).
Any weapon lore (such as Hafted Weapons when the Temple Guardian is wielding an axe) - will indirectly increase this combat art's execution speed, damage and chance to hit, and will allow the equippng of higher level weapons used to execute this combat art.
Combat Discipline - will increase its damage and reduce its regeneration time if this Combat Art is placed within a combo. This increase in damage is direct; it increases the +xx% that the CA adds to base damage.
Speed Lore - will increase its chance to hit indirectly by increasing a player's attack rating.
A melee Temple Guardian should keep Battle Extension in the active slot even when using regular left click attacks, as it gives a passive chance for double hits.
After executing Battle Extension, the player can switch to a Combat Art that uses the arm gun, and Battle Extension will being firing laser blasts from the Battery.
Battle Extension is slow to execute, even with a fast execution speed. Rather than immediately attacking, the Temple Guardian takes second to "wind-up," striking a pose before launching the attacks. Even though this CA inflicts powerful hits, with sufficiently high weapon lore and a good weapon a melee TG may actually kill more quickly by just using left click attacks or by spamming Dedicated Blow.
This slow execution speed was fixed in Community Patch 1.60. The "wind-up" battle pose is removed, and the execution speed of the three attacks is increased.
Pros and Cons
Hits multiple opponents
Passive double-hit chance when in the active CA slot
Very interesting attack animation when mounted - the Mobiculum spins around in place while the TG's weapon repeatedly comes down on the enemy.
Very slow execution speed (requires CM Patch to fix).