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Gray Goo

This puddle of gray sludge oozes forth as if alive.

Gray Goo CR 5

XP 1,600
N Fine construct (swarm)
Init +2; Senses blindsense 60 ft.; Perception +0

AC 20, touch 20, flat-footed 18; (+8 size, +2 Dex)
hp 49 (11d8)
Fort +3, Ref +5, Will +3
Defensive Abilities construct and swarm traits; Immune weapon damage

Speed 20 ft., climb 20 ft.
Melee swarm (3d6 plus disease and distraction)
Space 10 ft.; Reach 0 ft.
Special Attacks consume, disease, distraction (DC 15)

Str 1, Dex 15, Con —, Int —, Wis 10, Cha 2
Base Atk +11; CMB —; CMD

Environment any land
Organization solitary, pair, pool (3–6 swarms), or lake (7–16 swarms)
Treasure none

Consume (Ex) Gray goo can rapidly consume any creature or organic object it swarms over. Against helpless targets, nauseated targets, and unattended objects made of organic matter (such as bone, cloth, or wood), gray goo deals 6d6 points of damage.

Disease (Su) Assimilation: Swarm—injury; save Fort DC 15; onset 1 hour; frequency 1/hour; effect 1 point of Con damage; cure infected creature suffers 1 or more points of electricity damage. Any Medium or larger creature killed by assimilation rises as a clockwork zombie (see below). The save DC of assimilation is Constitution-based.