Adaptive Body. If the Bio #133 spends at least one hour touching a creature of certain types, its body physically changes, giving it a unique ability. It can only have one adaptation at a time.
Aberration: It becomes purple and rubbery, and can cast levitate on itself at will.
Celestial: It turns silver and gains a halo. This halo sheds bright light in a 10-foot radius and dim light for an additional 10 feet.
Construct: It gains clockwork features and does not require air, food, drink, or sleep.
Dragon: It grows superficial wings and scales. Its ranged attack deals fire damage instead of acid.
Elemental: Its body is covered in the related element, and it gains resistance to the appropriate damage type.
Ooze: It becomes translucent and gains the Amorphous trait.
Plant: Its fur is replaced with leaves, and it gains the False Appearance trait (resembling a shrub).
Multiattack. The Bio #133 makes up to two attacks: one bite attack and one spew attack.
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 3 (1d4 + 1) piercing damage, and the target must make a DC 11 Constitution saving throw, taking 7 (2d6) acid damage on a failed save, or half as much damage on a successful one.
Spew. Ranged Weapon Attack: +5 to hit, range 15/30 ft., one target. Hit: 9 (2d8) acid damage.
Description
The incredibly rare Bio #133 resembles a small, fluffy canine with a metal pack of fluorescent green fluid bolted onto its back. Created by an unknown team of scholars, these creatures get their name from the number of tests that led to their existence. Having escaped their creators, Bio #133s now race through new environments, collecting knowledge and physical traits as they travel.
Unstable Biology. Bio #133 is far from a complete project. The tube of fluid on the creatures’ back contains an unstable substance that has replaced their blood. This liquid makes its body wildly mutable, even allowing it to change its creature type.
Diverse Experience. The more a Bio #133 learns, the more qualities it is able to manifest. Spending time around ooze allows them to become amorphous, and time spent near water grants them gills. Although they have only recently sprung into existence, some of the most well-traveled ones can use globs of their “blood” to reproduce.