|Area(s)||Tephra Cave (Arachno Queen's Nest)|
|View Angle||360°||View Distance||24 M|
|Spawn Time||Story event|
The Arachno Queen is a boss in Xenoblade Chronicles. The party faces it upon leaving Colony 9, in the Arachno Queen's Nest in Tephra Cave. It is also one of the only bosses faced with only two characters, Shulk and Reyn.
The Arachno Queen resembles a spider of incredible large proportions. Her jaws are in a unique position, but otherwise her appearance matches most large spider species.
While the Arachno Queen does not play a major part in the overall storyline, it is the threat of this beast that causes the first new Monado ability to awaken; Monado Shield. Shulk can use Monado Shield to protect Reyn and himself from harm.The Arachno Queen's skill that can be blocked with the shield is Arachno Crush. It is a double attack and is the attack it used on Reyn in Shulk's vision.
Before they arrive it is said that the Arachno Queen has been eating travelers, which means nobody from Colony 9 or Colony 6 could visit each other. This is shown when Shulk and Reyn find some dead Colony 6 traders.
|HP||Strength||Ether||Agility||Double Attack Rate||Critical Hit Rate||Physical Defence %||Ether Defence %||Defence Direction|
|Dive Impact||Physical||2.3 - 2.5||1||Circle around caster||Topple||-||-|
|Arachno Crush I||Talent (Physical)||3.3 - 3.5||1||Single||-||-||Yes/Yes|
|Binding Web||Status||-||-||Frontal Arc||Bind||-||-|
|Lay Tribute||Status||-||-||Circle around caster||HP recovery (250), talent gauge increases||-||-|
|Queen's Order||Status||-||-||Circle around caster||Talent gauge increases||-||-|
|The Queen's Fury||Status||-||-||Self||Strength Up, talent gauge increases||-||-|
|Break||○||Lock-On||○||Physical Defence ▼||○||Agility ▼||○|
|Topple||○||Bind||○||Ether Defence ▼||○||Aura Seal||○|
|Daze||○||Paralysis||○||Attack Power ▼||○||Arts Seal||○|
|Sleep||○||Slow||○||Ether Power ▼||○||Death||×|
|△ = 70% resistance|
|▲ = 100% resistance unless certain conditions are met|
|◇ = 70% resistance, but no resistance during chain attack|
|◆ = 100% resistance, but no resistance during chain attack|
|○ = no resistance|
|× = immune|
- After the events at the Mechonis Core, the party can receive Battling Brutes, in which the party must kill two monsters at level 98 in the Arachno Queen's Nest. One is a Gogol and the other is an Arachno. They are most likely fighting over who will be the new leader of Tephra Cave after the Arachno Queen died.