Mongolian Death Worm

A thick red worm moves beneath desert sand without leaving a trail. Herd animals die before anyone sees it, and the first warning for travelers is often blue light crawling across nearby metal.

Sand Eruption: bludgeoning, melee 10 ft, +4 to hit, 2d10+3. Death Spark: lightning, 40 ft, +4 to hit, 3d6+3, and a target wearing metal suffers -2 AC against the attack.

Feels the Tremor: while beneath sand it knows the position of anything touching the ground. A creature that remains motionless cannot be located this way. Soaking the sand within 10 ft forces it to the surface and prevents burrowing for 2 rounds.