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IoA weapon developed by a long-lost civilization that has run out of control and hunts down humans with lethal precision. It is posited that these machines were originally configured to target only hostile enemies, and that a malfunction has led to their erratic current behavior. While few remain intact, they display incredible durability and destructive power, and adventurers that encounter one are encouraged to see that it is put out of commission… permanently.

Io (CR 14)

XP 38,400
N Huge Construct (Machina)
Init +6; Senses Darkvision 120 ft., low-light vision, superior optics; Perception +22


AC 29, touch 11, flat-footed 26 (+2 dex, +1 dodge, +18 natural, -2 size)
hp 154 (18d10+40), Force Field (90 hp, fast healing 18)
Fort +8, Ref +8, Will +7
Hardness 10; Immune Construct traits
Weakness Critical hits and Lightning


During Combat The io will start by using Rockets if really far away from it’s targets or Chain Guns if semi-far away. It will keep using Chain Guns until its foes get within 40 feet. If there is a group of foes within range, it will use Suppressing Fire. Sometimes it will use Booster Jets to get an advantage for shooting off more Rockets at it’s foes.


Speed 40 ft., Climb 25 ft.; Booster Jets
Melee 2 Claws +26 (2d4+10/19-20)
Ranged 2 Integrated Chain Guns +18 (7d6/x4)
Space 15 ft.; Reach 15 ft.
Special Attacks Combined Arms, Rockets, Suppressing Fire


Str 30, Dex 15, Con -, Int 14, Wis 13, Cha 1
Base Atk +18; CMB +30; CMD 42 (50 vs. trip)
Feats Combat Expertise, Combat Reflexes, Deadly Aim, Dodge, Great Fortitude, Improved Critical (Claw), Improved Initiative, Mobility, Skill Focus (Acrobatics)
Skills Acrobatics +26 (+34 when jumping), Climb +16, Intimidate +13, Perception +22, Sense Motive +22
Languages Common, + two more


Booster Jets (Su)

As a swift action up to 10 times per hour, an io can gain a fly speed of 60 feet (poor maneuverability) for a duration of 1 minute.

Chain Guns (Ex)

These advanced firearms have a range increment of 200 feet, automatically reload as a free action, and never misfire. An io’s core can process scrap metal into new ammunition, effectively giving io infinite ammo with these weapons. Integrated ranged weapons do not provoke attacks of opportunity when fired in melee combat.

Combined Arms (Su)

When taking a full attack action, an io can attack with melee and ranged integrated weapons simultaneously.

Force Field (Ex)

An io is sheathed in a thin layer of shimmering energy that grants it 90 bonus hit points. All damage dealt to an io with an active force field is reduced from these hit points first. As long as the force field is active, the io is immune to critical hits. An io’s force field has fast healing 18, but once its hit points are reduced to 0, the force field shuts down and does not reactivate for 24 hours.

Rockets (Ex)

Once every 1d2 rounds and as a standard action, an io can fire a rocket to a range of 800 feet. A rocket explodes on impact in a 30- foot-radius burst, dealing 6d6 points of fire damage and 6d6 points of bludgeoning damage to all creatures in the area (Reflex DC 21 halves). An io carries a maximum of five rockets. Its core can replenish fired rockets at the rate of one per 6 hours, crafting new rockets from scrap metal and other collected components used in the construction process. The save DC is Intelligence-based.

Suppressing Fire (Ex)

As a standard action, an io can use its chain guns to fire in a 100-foot cone. When it does so, it makes a single chain gun attack against every target in this area.

Superior Optics (Ex)

Io can see invisible creatures and objects as if they were visible.