Arachsiam is a Monolith boss you can defeat in Once Human. Read on for an overview of Arachsiam, their location, how to unlock, weaknesses, the best loadout, how to beat them, their attack patterns, and rewards!

Arachsiam Overview

Arachsiam Information

Arachsiam Information
The worst nightmare for people with arachnophobia. Mountain and canyon are their favorite habitats, providing all resources needed to knit a giant webconnecting two areas like a bridge. It is two to three times taller than an average adult, and moves with incredible swiftness. When you feel an ominous shadepassing your head, it is time to flee.
Level	Recommended Players	Type
30	2	Monolith

Arachsiam Location

Found in Mirage Monolith

You can find Arachsiam's domain in Mirage Monolith, more specifically in the location indicated on the map above!

Monolith Boss Fight is Different From Doppelganger Version

Prior to taking on Arachsiam, you will fight its doppleganger version in a preceding quest. Do note that these are different boss fights where the doppleganger version serves as an introduction to the actual boss.

The fight with the doppleganger lets you preview its attacks and plan how to take on the actual boss in the Monolith.

How to Unlock Arachsiam

Unlocked During the Realm of Nightmares Quest

You can fight Arachsiam by heading to the Mirage Monolith in the Iron River during the Realm of Nightmares quest. Enter the building and interact with the Rift Beacon to select which difficulty you wish to play on.

After defeating Arachsiam, you may return to its location and fight it once again either at the same difficulty or at higher ones. Do note that you will need to meet the required levels in order to fight it at higher difficulties.

Arachsiam Weaknesses

Arachsiam Weakspots
Pus-riddled Abdomen

To deal the optimal amount of damage to Arachsiam, focus on dealing damage around their specified weak spot. Doing so effectively doubles damage against Arachsiam!

Best Loadout for Arachsiam

Best Weapon and Mods

The best weapons to use against Arachsiam are Assault Rifles to effectively counter most of its patterns and gimmicks!

As for your secondary weapon, you can also use any Pistols to round out your weapon loadout!

List of All Assault Rifles

How to Beat Arachsiam

How to Beat Arachsiam
Bring a Ton of Supplies Fight From a Distance Dodge Web Attacks Shoot the Eggs

Bring a Ton of Supplies

Before attempting to fight Arachsiam, we highly recommend crafting a ton of supplies which include ammo, activators, and adrenaline shots.

This boss fight can get long and will require you to shoot a lot so it would be best to craft at least 2000 ammo for your rifle, 300 ammo for your pistol, and 20 activators as this gives you enough resources.

Fight From a Distance

Arachsiam's attacks can easily bring your health to half in an instant so it would be best to keep your distance as this gives you time to react. When Arachsiam gets close, dodge to the side and attack its weakspots to deal damage efficiently.

Dodge Web Attacks

Arachsiam has three web attacks that can immobilize you and put you in a vulnerable spot. Keep an eye on its web attacks and dodge accordingly to avoid getting webbed up.

Shoot the Eggs When Immune

Arachsiam can become immune to damage by climbing to the top of the pillar. To remove its immunity, you will need to shoot the spider eggs at the end of the web bridges.

Do note that while Arachsiam is perched on the pillar it can still attack you with web projectiles so listen for sound cues and look at Arachsiam to know when to dodge.

Arachsiam Attack Patterns

Arachsiam Attack Patterns
Web Pull Web Projectiles Mist Spider Eggs Jump Attack Rushing Attack

Web Pull

Arachsiam will shoot a web that will put you towards it. While webbed, you cannot move or use attacks. This can be very difficult to dodge and it will almost always connect so just be ready to roll out after the web is removed.

Web Projectiles

Arachsiam throws out webs from above and lands on the ground. If you get hit by the web or step into it, you will be wrapped in web for a few seconds. It would be best to dodge these as they land then make your way to another part of the playing area to avoid stepping on them.

Mist

While this attack doesn't damage you, it reduces visibility by a lot and can leave you vulnerable to surprise attacks. Before the mist fully envelops the area, keep attacking Arachsiam to maintain visibility.

Spider Eggs

In addition to the spider eggs across the web bridges, Arachsiam can also lay eggs on the battlefield however these eggs won't spawn spirderlings until you get close to it.

We recommend that you destroy the eggs as soon as they spawn so you can keep the area clean and focus fighting Arachsiam.

Jump Attack

Arachsiam jumps in the air and lands in a target area, dealing damage to anything caught underneath it. This move is well telegraphed and gives you an opportunity to time your roll and dodge away from it.

Rushing Attack

Arachsiam rushes towards you and deals damage. Similar to the jump attack, you can wait for Arachsiam to get close and roll out of the way to dodge this attack.

Arachsiam Rewards

• Energy Link
• Gear Mod x2
• Weapon Mod Parts
• Stardust Source
• Electronic Part

Once Human Related Guides

List of All Bosses

All Bosses

Ravenous Hunter	Treant
Arachsiam	Shadow Hound