some possibilities:
Acid (Ex): A denzelian secretes acid from its entire surface, to allow it to burrow through rock. This acid also serves as a digestive enzyme, breaking down stone and earthen material so that it can be eaten. This acid also damages flesh and organic material but it does not affect metal. Any melee hit deals acid damage.
A creature falling on top of a denzelian takes 5d4 points of acid damage (Reflex DC X half), and all of its non-metallic equipment dissolves and becomes useless immediately unless it succeeds on a DC X Reflex save. A wooden weapon that strikes a denzelian also dissolves immediately unless its succeeds on a DC X Reflex save. The save DCs are Constitution-based.
The denzelian's acidic touch deals 14 points of damage per round to stone or wooden objects, but the denzelian must remain in contact with the object for 1 full round to deal this damage.
Crush (Ex): A falling denzelian can land on an opponent as a standard action, using its whole body to crush them. Crush attacks are effective only against one opponent of Medium or smaller size at one time. An affected creature must succeed on a DC X Reflex save or be pinned, automatically taking 4d6 points bludgeoning damage and 5d4 points of acid damage during the next round unless the denzelian moves off it. If the denzelian chooses to maintain the pin, treat it as a normal grapple attack. Pinned opponents take damage from the crush and acid each round if they don't escape.
When a denzelian dissolves rock, it leaves a crumbly, blackish, sandlike residue behind. When it makes a crush attack, this gritty substance fills the air in a 10 foot radius. It gets in the eyes, nose, and mouth of nearby creatures, who must succeed on a DC X Fortitude save or suffer a –2 to attack rolls for 1d4+1 rounds (or when the substance is washed away). The save DCs are Constitution?-based.
Trip (Ex): A charging denzelian that hits with its touch attack can attempt to trip the opponent (+X check modifier) as a free action without provoking an attack of opportunity. If the attempt succeeds, the victim falls on top of the denzelian and takes acid damage. If the attempt fails, the opponent cannot react to trip the denzelian.