Environmental GraftsThese environmental grafts can be applied to any creature, though additional adjudication may be needed when applying them to humanoids, monstrous humanoids, and outsiders.
Source Alien Archive 2 pg. 141
Creatures that live underground have unique habits and abilities. Most subterranean beasts live the majority of their lives burrowing in the ground. Others live in warrens they dig or in caverns and similar natural structures. Some planets have subterranean realms rich with life, while other such regions are as desolate as any desert.
Burrowing: You can give subterranean creatures a burrow speed.
Climbing: Climbing can be useful in caves, and subterranean creatures often have climb speeds equal to their land speeds. If the creature does not have burrowing, you can also give it the spider climb universal creature rule without that counting against its number of special abilities.
Senses: Assuming the underground region is lightless, give the creature a form of blindsense or blindsight, or darkvision with a range of at least 60 feet. Some subterranean creatures suffer light blindness, and a few species are sightless.
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