Cthonic Creature

Chthonic Creature (CR +0 or +1)
Chthonic creatures are native denizens of the Elemental Plane of Earth. They produce acid, which they use to help them burrow quickly through the dense rock of their homes. A chthonic creature’s CR increases by 1 only if the base creature has 5 or more HD.

Rebuild Rules: Senses gains darkvision; Defensive Abilities gains DR and resistance to acid as noted on the table below; Speed gains a burrow speed equal to half its highest speed (leaves no tunnel); Attacks gains bonus acid damage as noted on the table below on attacks with natural weapons.

Hit Dice DR Resist Acid Acid Damage
1–4 10 1
5–10 3/— 15 1d6
11+ 5/— 20 2d6
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